.: 2012

Read XML Taglib and JSTL in JSP

samle.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<weather ver="2.0">
<loc id="INXX0096">
<dnam>New Delhi, India </dnam>
<tm>3:30 PM </tm>
</loc>
<cc>
<tmp>75 </tmp>
<bar>
<r>29.94 </r>
<d>steady </d>
</bar>
</cc>
</weather>

--------------------------------
xml_read.jsp

<%@ page contentType="text/html; charset=iso-8859-1" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<c:import url="http://localhost:8080/XML/samle.xml" var="xml"/>
<x:parse xml="${xml}" varDom="dom"/>
<html>
<head>
<title>Read XML through taglib JSTL</title>
</head>

<body>
<x:forEach select="$dom/weather/cc/tmp" var="tmp">
<x:out select="$tmp" />
</x:forEach>

<br>

<x:forEach select="$dom/weather/cc/bar/d" var="d">
<x:out select="$d" />
</x:forEach>
</body>
</html>

How to read XML file in java

books.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<library>
<book>
<name>Head First Java, 2nd Edition</name>
<author>Kathy Sierra and Bert Bates</author>
<publication-date>09-Feb-2005</publication-date>
</book>
<book>
<name>Effective Java</name>
<author>Joshua Bloch</author>
<publication-date>28-May-2008</publication-date>
</book>
<book>
<name>Java How to Program, 7th Edition</name>
<author>Harvey M. Deitel and Paul J. Deitel</author>
<publication-date>6-Jan-2007</publication-date>
</book>
</library>

------------------------------------------------------------
readDOMXML.jsp

<%@ page language="java" %>
<%@ page import="org.w3c.dom.*" %>
<%@ page import="javax.xml.parsers.DocumentBuilder" %>
<%@ page import="javax.xml.parsers.DocumentBuilderFactory" %>
<%
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
DocumentBuilder db =dbf.newDocumentBuilder();
Document doc=db.parse("c:\\books.xml");

NodeList nl = doc.getElementsByTagName("book");

%>
<html>
<head>
<title>How to read XML file in JAVA</title>
</head>
<body>
<%

for(int i=0;i<nl.getLength();i++)
{
NodeList nameNlc= doc.getElementsByTagName("name");
Element nameElements=(Element)nameNlc.item(i);
String nameTagValue=nameElements.getChildNodes().item(0).getNodeValue();

NodeList authorNlc= doc.getElementsByTagName("author");
Element authorElements=(Element)authorNlc.item(i);
String authorTagValue=authorElements.getChildNodes().item(0).getNodeValue();

NodeList dateNlc= doc.getElementsByTagName("publication-date");
Element dateElements=(Element)dateNlc.item(i);
String dateTagValue=dateElements.getChildNodes().item(0).getNodeValue();

out.println("name :"+nameTagValue+"<br>");
out.println("author :"+authorTagValue+"<br>");
out.println("publication-date :"+dateTagValue+"<br><br>");
}

%>

</body>
</html>

getElementsByTagName in javascript

<html>
<head>
<title>getElementsByTagName Javascript</title>
<script>
function getElementFtn()
{
alert(document.getElementsByTagName("p").item(0).innerHTML)
}
</script>
</head>

<body>
<p>this is first tag</p>

<p>this is second</p>

<p id="pID">this is third tag</p>

<p>this is forth tag</p>

<p>this is fifth tag</p>

<a href="javascript:getElementFtn()">check this element</a>
</body>
</html>

Form parameter validation using javascript(username,password,email,number,alphanumeric))

UserName Password validation

<html>
<head>
<title>Required Validation</title>
<script>
function validate()
{
var vUser=trim(document.frm.sUser.value);
var vPwd=trim(document.frm.sPwd.value);

if(vUser=="")
{
alert("User Name Field is Empty");
document.frm.sUser.focus();
return false;
}
else if(vPwd=="")
{
alert("Password Field is Empty");
document.frm.sPwd.focus();
return false;
}
}

function trim(s) {
return s.replace( /^\s*/, "" ).replace( /\s*$/, "" );
}

</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
User Name <input type="text" name="sUser" /><br>
Password <input type="password" name="sPwd" /><br>
<input type="submit" name="goTo" value="Submit"/>
</form>
</body>
</html>

----------------------------------------------------------------
Number or Integer Validation

<html>
<head>
<title>Number Integer Validation</title>
<script>

function validate()
{
var dValidate=document.frm.numberValidate.value;
if(dValidate=="")
{
alert("Number Field is empty")
return false;
}
else if(isDigits(dValidate)==false)
{
alert("Field is not numeric")
return false;
}
}

function isDigits(argvalue) {
argvalue = argvalue.toString();
var validChars = "0123456789";
var startFrom = 0;
if (argvalue.substring(0, 2) == "0x") {
validChars = "0123456789abcdefABCDEF";
startFrom = 2;
} else if (argvalue.charAt(0) == "0") {
validChars = "01234567";
startFrom = 1;
}
for (var n = 0; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Number <input type="text" name="numberValidate" />
<input type="submit" name="goTo" value="Number Validate" />
</form>
</body>
</html>

------------------------------------------------------------------
Date Validation

<html>
<head>
<title>Date Validation</title>
<script>
function validate()
{
var dValidate=document.frm.dateValidate.value;
if(dValidate!="")
{
var arDValidate=dValidate.split("/");
if(arDValidate.length==3)
{
if(arDValidate[0].length!=2 || (arDValidate[0]>32))
{
alert("Wrong Date format");
return false;
}
else if(arDValidate[1].length!=2 || (arDValidate[1]>13))
{
alert("Wrong Month format");
return false;
}
else if(arDValidate[2].length!=4 || (arDValidate[2]<1900))
{
alert("Wrong Year format");
return false;
}
else
{
var dateDate=new Date(arDValidate[2],arDValidate[1]-1,arDValidate[0]);
if((arDValidate[0]!=dateDate.getDate()))
{
alert("Wrong Date Enter e.g date month year is not correct 31 feb 2009");
return false;
}
}
}
else
{
alert("Wrong Format");
return false;
}
}
else
{
alert("Date is blank");
return false;
}
}

</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
mm/dd/yyyy <input type="text" name="dateValidate" />
<input type="submit" name="goTo" value="Date Validate" />
</form>
</body>
</html>

-------------------------------------------------------------------
Email Validation

<html>
<head>
<title>Email Validation</title>
<script>
function validate()
{
var dValidate=document.frm.emailValidate.value;
if(dValidate=="")
{
alert("Email Field is empty")
return false;
}
else if(checkEmail(dValidate)==false)
{
alert("Email Format is not correct")
return false;
}
}

function checkEmail(emailStr) {
if (emailStr.length == 0) {
return true;
}
var emailPat=/^(.+)@(.+)$/;
var specialChars="\$\$<>@,;:\\\\\\\"\\.\\[\\]";
var validChars="\[^\\s" + specialChars + "\]";
var quotedUser="(\"[^\"]*\")";
var ipDomainPat=/^(\d{1,3})[.](\d{1,3})[.](\d{1,3})[.](\d{1,3})$/;
var atom=validChars + "+";
var word="(" + atom + "|" + quotedUser + ")";
var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
var domainPat=new RegExp("^" + atom + "(\\." + atom + ")*$");
var matchArray=emailStr.match(emailPat);
if (matchArray == null) {
return false;
}
var user=matchArray[1];
var domain=matchArray[2];
if (user.match(userPat) == null) {
return false;
}
var IPArray = domain.match(ipDomainPat);
if (IPArray != null) {
for (var i = 1; i <= 4; i++) {
if (IPArray[i] > 255) {
return false;
}
}
return true;
}
var domainArray=domain.match(domainPat);
if (domainArray == null) {
return false;
}
var atomPat=new RegExp(atom,"g");
var domArr=domain.match(atomPat);
var len=domArr.length;
if ((domArr[domArr.length-1].length < 2) ||
(domArr[domArr.length-1].length > 3)) {
return false;
}
if (len < 2) {
return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Email <input type="text" name="emailValidate" />
<input type="submit" name="goTo" value="Email Validate" />
</form>
</body>
</html>

------------------------------------------------------------------
Alpha Character Validation

<html>
<head>
<title>Alpha number Validation</title>
<script>

function validate()
{
var dValidate=document.frm.alphaValidate.value;
if(dValidate=="")
{
alert("Alpha Field is empty")
return false;
}
else if(isAlpha(dValidate)==false)
{
alert("Field is not alpha character")
return false;
}
}

function isAlpha(argvalue) {
argvalue = argvalue.toString();
var validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

for (var n = 0; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1)
return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Alpha Character <input type="text" name="alphaValidate" />
<input type="submit" name="goTo" value="Alpha Validate" />
</form>

</body>
</html>

Enable Disable Radio button Text box in JavaScript

<html>
<head>
<title>Enable Disable Radio button Text box in javascript</title>
</head>
<script>
function chMd()
{
// initialize form with empty field
document.forms[0].sTextBox.disabled=false;
document.forms[0].sTextBox.value="";

document.forms[0].eTextBox.disabled=false;
document.forms[0].eTextBox.value="";

document.forms[0].goServer.disabled=false;

for(var i=0;i<document.forms[0].elements.length;i++)
{
if(document.forms[0].elements[i].name=="dOption")
{
if(document.forms[0].elements[i].value=="N")
{
if(document.forms[0].elements[i].checked==true){

document.forms[0].sTextBox.disabled=true;
document.forms[0].eTextBox.disabled=true;

document.forms[0].sRadio[0].disabled=true;
document.forms[0].sRadio[1].disabled=true;
document.forms[0].sRadio[2].disabled=true;

document.forms[0].goServer.disabled=true;
}
}
else if(document.forms[0].elements[i].value=="T")
{
if(document.forms[0].elements[i].checked==true){
document.forms[0].sTextBox.disabled=false;
document.forms[0].eTextBox.disabled=false;

document.forms[0].sRadio[0].disabled=true;
document.forms[0].sRadio[1].disabled=true;
document.forms[0].sRadio[2].disabled=true;

document.forms[0].goServer.disabled=false;
}
}
else if(document.forms[0].elements[i].value=="R")
{
if(document.forms[0].elements[i].checked==true){
document.forms[0].sTextBox.disabled=true;
document.forms[0].eTextBox.disabled=true;

document.forms[0].sRadio[0].disabled=false;
document.forms[0].sRadio[1].disabled=false;
document.forms[0].sRadio[2].disabled=false;

document.forms[0].goServer.disabled=false;
}
}
}
}
}
</script>

<body>
<form name="fRadio">
<input name="dOption" value="N" checked="checked" onClick="chMd()" type="radio">
No Constraints <br />

<input name="dOption" value="T" onClick="chMd()" type="radio"> Text Box

<input name="sTextBox" size="10" disabled="disabled" type="text">
<input name="eTextBox" size="10" disabled="disabled" type="text"> <br/>

<input name="dOption" value="R" onClick="chMd()" type="radio"> Radio Button
Radio A <input name="sRadio" value="A" disabled="disabled" type="radio">
Radio B <input name="sRadio" value="B" disabled="disabled" type="radio">
Radio C <input name="sRadio" value="C" disabled="disabled" type="radio"> <br/>
<input name="goServer" value="Go" disabled="disabled" type="button">
</form>
</body>
</html>

Selecting all checkboxes using javascript

<html>
<head>
<title>JavaScript - Select All checkbox in form</title>
<script>
var fieldName='chkName';

function selectall(){
var i=document.frm.elements.length;
var e=document.frm.elements;
var name=new Array();
var value=new Array();
var j=0;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
if(document.frm.elements[k].checked==true){
value[j]=document.frm.elements[k].value;
j++;
}
}
}
checkSelect();
}
function selectCheck(obj)
{
var i=document.frm.elements.length;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
document.frm.elements[k].checked=obj;
}
}
selectall();
}

function selectallMe()
{
if(document.frm.allCheck.checked==true)
{
selectCheck(true);
}
else
{
selectCheck(false);
}
}
function checkSelect()
{
var i=document.frm.elements.length;
var berror=true;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
if(document.frm.elements[k].checked==false)
{
berror=false;
break;
}
}
}
if(berror==false)
{
document.frm.allCheck.checked=false;
}
else
{
document.frm.allCheck.checked=true;
}
}
</script>
</head>

<body>
<form name="frm">
select all :<input type="checkbox" name="allCheck" onClick="selectallMe()">
<hr><br>
1 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
2 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
3 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
4 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
5 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
6 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
7 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
8 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
9 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
10 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
</form>
</body>
</html>

Get Checkbox Value using javascript

<html>
<head>
<title>JavaScript select checkbox</title>
<script>
function selectCheckBox()
{
var e= document.frm.elements.length;
var cnt=0;

for(cnt=0;cnt<e;cnt++)
{
if(document.frm.elements[cnt].name=="id"){
alert(document.frm.elements[cnt].value)
}
}
}
</script>
</head>

<body>
<form name="frm">
<input type="checkbox" name="id" value="1">
<input type="checkbox" name="id" value="2">
<input type="checkbox" name="id" value="3">
<input type="checkbox" name="id" value="4">
<input type="checkbox" name="id" value="5">
<input type="button" name="goto" onClick="selectCheckBox()" value="Check">
</form>
</body>
</html>

The example is showing how to get value from separate name checkbox in JavaScript.

<html>
<head>
<title>JavaScript select checkbox</title>
<script>
function selectCheckBox()
{
alert(document.frm.id1.value)
alert(document.frm.id2.value)
alert(document.frm.id3.value)
}
</script>
</head>

<body>
<form name="frm">
<input type="checkbox" name="id1" value="1">
<input type="checkbox" name="id2" value="2">
<input type="checkbox" name="id3" value="3">

<input type="button" name="goto" onClick="selectCheckBox()" value="Check">
</form>
</body>
</html>

More than one form in HTML page

Confirm function in Javascript

<html>
<head>
<title>Confirm javascript</title>
<script>
function validate()
{
var confirmMessage="Are you sure to move Yahoo home page!";

if(confirm(confirmMessage)==false)
{
return false;
}
}
</script>
</head>

<body>
<form name="frm" action="http://yahoo.com" onSubmit="return validate()">
<input type="submit" name="goSubmit" value="Submit" />
</form>
</body>
</html>

Calling href using JavaScript

<html>
<head>
<title>Calling JavaScript Href</title>
<script>
function callHref()
{
alert("Function is called from Href");
}
</script>
</head>

<body>
<a href="javascript:callHref()">Calling JavaScript Href </a>
</body>
</html>

How to Submit a Form Using JavaScript

<html>
<head>
<title>Submit form using javascript</title>
<script>
function goSubmit()
{
document.frm.submit();
}
</script>
</head>

<body>
<form name="frm">
<a href="javascript:goSubmit()">Submit form </a>
<br>
<input type="button" name="btn" value="Submit" onClick="goSubmit()">
</form>
</body>
</html>

How to get day month year in date

import java.util.Calendar;

public class GetDate {
public static void main(String[] args) {

Calendar ca1 = Calendar.getInstance();

/// get day month year from set date
ca1.set(2009, 05, 15); // dont set this date if current date is required

int iDay=ca1.get(Calendar.DATE);
int iMonth=ca1.get(Calendar.MONTH); // In Current date Add 1 in month
int iYear=ca1.get(Calendar.YEAR);

System.out.println("Day :"+iDay);
System.out.println("Month :"+iMonth);
System.out.println("Year :"+iYear);
}
}

How to find Week of Year

import java.util.Calendar;

public class WeekOfYear {

public static void main(String[] args) {

Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);

System.out.println("WEEK OF YEAR :"+WEEK_OF_YEAR);
}
}

How to get Day of Week in Month

import java.util.Calendar;

public class DayOfWeekInMonth {

public static void main(String[] args) {

Calendar ca1 = Calendar.getInstance();

ca1.set(2009, 6, 22);

int DAY_OF_WEEK_IN_MONTH=ca1.get(Calendar.DAY_OF_WEEK_IN_MONTH);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/

System.out.println("DAY OF WEEK IN MONTH :"+DAY_OF_WEEK_IN_MONTH);
}
}

How to Add or Subtract Date

import java.util.Calendar;

public class AddDate {

    public static void main(String[] args) {

    Calendar ca1 = Calendar.getInstance();
    ca1.set(2009,05,25);

    // Addition of date in java        
    ca1.add(Calendar.DATE, 23); // Add 23 days in Dates in Calendar
    //ca1.add(Calendar.MONTH, 2); // Add 2 Month in Date in Calendar
    //ca1.add(Calendar.YEAR, 4); // Add 4 Year in Date in Calendar

    /*
     *  Subtracting Date in Calendar
     *  
     *  ca1.add(Calendar.DATE, -23); // Subtracting 23 days from date
     *  //ca1.add(Calendar.MONTH, -2); // Subtracting 2 Month in Date in Calendar
     *  //ca1.add(Calendar.YEAR, -4); // Subtracting 4 Year in Date in Calendar
     */

    System.out.println("Date :"+ca1.get(Calendar.DATE));
    System.out.println("Month :"+ca1.get(Calendar.MONTH));
    System.out.println("Year :"+ca1.get(Calendar.YEAR));
    }
}

find Week of Month in java

import java.util.Calendar;

public class WeekOfMonth {

public static void main(String[] args) {
Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
System.out.println("Week of Month :"+WEEK_OF_MONTH);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/
}
}

find Day of Year in Java

import java.util.Calendar;

public class DayOfYear {

public static void main(String[] args) {
Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

/*
2 Feb 2009, Day of Year, Jan 31 + 2 Feb =33 day of year
*/

int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
System.out.println("Day of Year :"+DAY_OF_YEAR);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/
}
}

How to Create file in Java

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;

public class JavaIOWriteFileExample {

public static void main(String[] args) {

File f=new File("c:\\createNewfile.txt");

try{
FileWriter fstreamCopy = new FileWriter(f);
BufferedWriter outobjCopy = new BufferedWriter(fstreamCopy);
outobjCopy.write("The content write to inside the file");
outobjCopy.close();
}
catch (Exception e){
e.printStackTrace();
}
}
}

SortedSet Example

import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;

public class SortedSetExample {

public static void main(String[] args) {

SortedSet<String> ss=new TreeSet<String>();

ss.add("a");
ss.add("e");
ss.add("g");
ss.add("b");
ss.add("c");

Iterator it=ss.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

Remove elements from SortedMap

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

public class SortedMapRemoveExample {

public static void main(String[] args) {

SortedMap<Integer,String> sm=new TreeMap<Integer, String>();

sm.put(new Integer(2), "Two");
sm.put(new Integer(1), "One");
sm.put(new Integer(4), "Four");
sm.put(new Integer(3), "Three");
sm.put(new Integer(5), "Five");

// SortedMap remove object
sm.remove(new Integer(4));

Set s=sm.entrySet();

Iterator i=s.iterator();

while(i.hasNext())
{
Map.Entry m =(Map.Entry)i.next();

int key = (Integer)m.getKey();
String value=(String)m.getValue();

System.out.println("Key :"+key+" value :"+value);
}
}
}

Remove elements from SortedSet

import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;

public class SortedSetRemoveExample {

public static void main(String[] args) {

SortedSet<String> ss=new TreeSet<String>();

ss.add("a");
ss.add("e");
ss.add("g");
ss.add("b");
ss.add("c");

// remove SortedSet object
ss.remove("g");

Iterator it=ss.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

Remove elements from Set

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;

public class SetRemoveExample {

public static void main(String[] args) {

Set<String> s=new TreeSet<String>();

s.add("b");
s.add("a");
s.add("d");
s.add("c");

// Set remove object
s.remove("d");

Iterator it=s.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

Remove elements from Map

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class MapRemoveExample {

public static void main(String[] args) {

Map<Object,String> mp=new HashMap<Object, String>();

mp.put(new Integer(2), "Two");
mp.put(new Integer(1), "One");
mp.put(new Integer(3), "Three");
mp.put(new Integer(4), "Four");

// remove map object
mp.remove(new Integer(3)); // remove map by object

Set s=mp.entrySet();

Iterator it=s.iterator();

while(it.hasNext())
{
Map.Entry m =(Map.Entry)it.next();

int key=(Integer)m.getKey();

String value=(String)m.getValue();

System.out.println("Key :"+key+" Value :"+value);
}
}
}

Remove Element from ArrayList

import java.util.ArrayList;

public class RemoveArrayListElement {

public static void main(String[] args) {

ArrayList<String> arlist=new ArrayList<String>();

//<E> it is return type of ArrayList

arlist.add("First Element"); // adding element in ArrayList
arlist.add("Second Element");
arlist.add("Third Element");
arlist.add("forth Element");
arlist.add("fifth Element");

// remove array list element by index number
arlist.remove(3);

// remove ArrayList element by Object value
arlist.remove("fifth Element");

// get elements of ArrayList
for(int i=0;i<arlist.size();i++)
{
System.out.println("ArrayList Element "+i+" :"+arlist.get(i));
}
}
}

Remove elements from List

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ListRemoveExample {

public static void main(String[] args) {

List<String> ls=new ArrayList<String>();

ls.add("one");
ls.add("Three");
ls.add("two");
ls.add("four");

// remove list object
ls.remove(2); // remove by index number

ls.remove("four"); // remove by object

Iterator it=ls.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

List Example in java

import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;

public class ListExample {

public static void main(String[] args) {

// List Example implement with ArrayList
List<String> ls=new ArrayList<String>();

ls.add("one");
ls.add("Three");
ls.add("two");
ls.add("four");

Iterator it=ls.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

Greatest Common Divisor or GCD using Recursion in java

public class GCD
{
    public static int gcd(int num1, int num2)
    {
        if(num2 == 0)
        {
            return num1;
        }
        else
        {
            return gcd(num2, num1%num2);
        }
    }

}

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
       Scanner input = new Scanner(System.in);

      System.out.print("Enter the first number: ");
      int num1 = input.nextInt();

      System.out.print("Enter the second power: ");
      int num2 = input.nextInt();

      GCD access = new GCD();

      System.out.print("The GCD of 2 numbers is: " + access.gcd(num1, num2));

    }

}

Recursive function for X to the power Y

public class Power
{
    public static double power(double base, double basePow)
    {
        
        if(basePow==0)
        {
            return 1;
        }
        else if(basePow==1)
        {
            return base;
        }
        else if(basePow>1)
        {
            return base*power(base,basePow-1);
        }
        else
        {

              return 1/power(base, -1 * basePow);
        }
       
       
    }
    
}

//main class

import java.util.Scanner;

public class Main {

    public static void main(String[] args)
    {
      Scanner input = new Scanner(System.in);

      System.out.print("Enter the base number: ");
      double base = input.nextInt();

      System.out.print("Enter the base power: ");
      double basePow = input.nextInt();

      
      Power access = new Power();
      
      System.out.print(base + " to the power of " + basePow + " is: " + access.power(base, basePow));

    }

}

Recursive Koch Snow Flakes in java

import java.awt.*;

import javax.swing.*;

public class recursiveKochSnowFlakes extends JApplet{
 int level = 0;

 public void init(){
  String levelStr = JOptionPane.showInputDialog("Enter the depth of recursion");

  level = Integer.parseInt(levelStr);
 }

 public void paint(Graphics g){

  drawSnow(g,level,20,280,280,280);
  drawSnow(g,level,280,280,150,20);
  drawSnow(g,level,150,20,20,280);

 }

 private void drawSnow (Graphics g, int lev, int x1, int y1, int x5, int y5){
       int deltaX, deltaY, x2, y2, x3, y3, x4, y4;

       if (lev == 0){

        g.drawLine(x1, y1, x5, y5);
       }
       else{
         deltaX = x5 - x1;
         deltaY = y5 - y1;

         x2 = x1 + deltaX / 3;
         y2 = y1 + deltaY / 3;

         x3 = (int) (0.5 * (x1+x5) + Math.sqrt(3) * (y1-y5)/6);
         y3 = (int) (0.5 * (y1+y5) + Math.sqrt(3) * (x5-x1)/6);

         x4 = x1 + 2 * deltaX /3;
         y4 = y1 + 2 * deltaY /3;

         drawSnow (g,lev-1, x1, y1, x2, y2);
         drawSnow (g,lev-1, x2, y2, x3, y3);
         drawSnow (g,lev-1, x3, y3, x4, y4);
         drawSnow (g,lev-1, x4, y4, x5, y5);
        }
    }
}

Program that will Determine the Person's Salutation and Current Age

public class Person
{
    private String fName;
    private String lName;
    private String sex;
    
    private int year;
    private int month;
    private int day;
    

    public Person()
    {
        fName="";
        lName="";
        sex="";
        
        year=0;
        month=0;
        day=0;
    }
    public Person(String fName1, String lName1, String gender)
    {
        fName=fName1;
        lName=lName1;
        sex=gender;
       
    }
    public String getFName()
    {
        return fName;
    }
    public void setFName(String fName1)
    {
        fName=fName1;
    }
    public String getLName()
    {
        return lName;
    }
    public void setLName(String lName1)
    {
        lName=lName1;
    }
    public String getSex()
    {
        return sex;
    }
    public void setSex(String gender)
    {
        sex=gender;
    }
    public int getYear()
    {
        return year;
    }
    public void setYear(int year1)
    {
        year=year1;
    }
    public int getMonth()
    {
        return month;
    }
    public void setMonth(int month1)
    {
        month=month1;
    }
    public int getDay()
    {
        return day;
    }
    public void setDat(int day1)
    {
        day=day1;
    }
    public String getFullName()
    {
        if(sex.equals("f"))
        {
            return "Ms. "+ fName + " "+lName;
         
        }
        else
        {
           return "Mr. "+ fName +" "+lName;
        }
    }
    public String getAge(int cYear, int cMonth, int cDay, int bYear, int bMonth, int bDay)
    {
        
        String result="";
        int tYear;
        if((cYear>bYear) && (cMonth==bMonth))
        {
            if(cDay==bDay)
            {
               tYear=cYear-bYear;
               result= "Happy " + tYear + "th birthday!";
            }
            else if(cDay>bDay)
            {
               tYear=cYear-bYear;
               result= "Current Age: " + tYear + " years old.";
            }
            else if(cDay<bDay)
            {
                tYear=(cYear-1)-bYear;
               result= "Current Age: " + tYear + " years old.";
            }
        }
        else if((cYear > bYear) && (cMonth > bMonth))
        {
            tYear=cYear-bYear;
            result= "Current Age: " + tYear + " years old.";
        }
        else if((cYear > bYear) && (cMonth < bMonth))
        {
            tYear=(cYear-1)-bYear;
            result= "Current Age: " + tYear + " years old.";
        }
        else if(cYear<bYear)
        {
            result= "Wrong Input. Age Calculation Failed.";
        }
        return result;

    }
            
}


//main class


import java.util.Scanner;


public class Main
{

    
    public static void main(String[] args)
    {

        Scanner input = new Scanner(System.in);

        String fName, lName, gender;
        int cYear, cMonth, cDay;
        int bYear, bMonth, bDay;


        System.out.print("Enter you first name: ");
        fName= input.nextLine();

        System.out.print("Enter you last name: ");
        lName= input.nextLine();

        System.out.print("Enter you Gender: ");
        gender= input.nextLine();


        System.out.print("Please Enter current Date: ");
        cDay= input.nextInt();

        System.out.print("Please Enter current Month: ");
        cMonth= input.nextInt();

        System.out.print("Please Enter current Year: ");
        cYear= input.nextInt();

        System.out.println("-----BIRTHDAY INFORMATION-----");
        System.out.print("Please Enter your Birth Date: ");
        bDay= input.nextInt();

        System.out.print("Please Enter your Birth Month: ");
        bMonth= input.nextInt();

        System.out.print("Please Enter your Birth Year: ");
        bYear= input.nextInt();

        Person access = new Person(fName, lName, gender);
        System.out.println("Name: "+access.getFullName());
        System.out.println(access.getAge(cYear, cMonth, cDay, bYear, bMonth, bDay));
        

    }

}

-----------------------------------

Sample Output 1:
Enter you first name: Johny
Enter you last name: Smith
Enter you Gender: M
Please Enter current Date: 3
Please Enter current Month: 02
Please Enter current Year: 2012
-----BIRTHDAY INFORMATION-----
Please Enter your Birth Date: 3
Please Enter your Birth Month: 02
Please Enter your Birth Year: 1989

Binary Search Using Recursion in java

public class binarySearch
{

    public int binSearch(int[] arr, int fIndex, int lIndex,int search)
    {

int middle = (fIndex + (lIndex - fIndex) / 2);

  if(fIndex<lIndex ){

   if (search == arr[middle]){

    return middle;
   }

   else if(search < arr[middle]){
    if(search == arr[0])
     return 0;
    return binSearch(arr, fIndex, middle, search);
   }

   else if(search > arr[middle]){
    if(search == arr[middle+1])
     return middle + 1;
    return binSearch(arr, middle+1, lIndex, search);
   }

  }
    return -1;
    }

 public void sort(int[] arr)
{
       for(int i=0; i<arr.length; i++)
        {
            for(int j=i+1; j<arr.length; j++ )
            {
                if(arr[i] > arr[j])
                {
                    int temp = arr[j];
                    arr[j]=arr[i];
                    arr[i]= temp;
                }
            }
        }

       for(int i=0; i<arr.length; i++)
       {
           System.out.print(arr[i] + " ");
       }
}

}

//main class


import java.util.Scanner;

public class Main {

    public static void main(String[] args)
    {
         Scanner input = new Scanner(System.in);

        System.out.print("Enter the size of the array: ");
        int n = input.nextInt();
        int[] x = new int[n];

        System.out.print("Enter "+ n +" numbers: ");
        int middle;
        for(int i=0; i<n; i++)
        {
            x[i] = input.nextInt();
        }

        binarySearch access = new binarySearch();
        System.out.println("The sorted numbers are: ");
        access.sort(x);
        System.out.println();
        
        System.out.print("Enter the number you want to search: ");
        int value = input.nextInt();

        System.out.print("The search number is on the index ");
        System.out.print(access.binSearch(x, 0, x.length-1, value));
    }

}

Recursive Linear Search in java

public class Linear_Search

{

public void linSearch2(int[] arr, int fIndex, int lIndex, int searchNum)

{

if(fIndex == lIndex)

{

System.out.print("-1");

}

else

{

if(arr[fIndex] == searchNum)

{

System.out.print(fIndex);

}

else

{

linSearch2(arr, fIndex+1, lIndex, searchNum);

}

}

}

//main class


import java.util.Scanner;

public class Main {


    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter the size of the array: ");
        int size = input.nextInt();
        System.out.print("Enter an array of numbers: ");

        int[] arr = new int[size];

        for(int i=0; i<arr.length; i++)
        {
            arr[i]=input.nextInt();
        }

        System.out.print("Enter the number you want to search: ");
        int search = input.nextInt();

       

        Linear_Search access = new Linear_Search();

        System.out.print("The position of the search item is at array index ");
        access.linSearch2(arr, 0, arr.length, search);
    }

}

How to sort numbers in Bubble Sort

public class BubbleSort
{

 public void bubbleSort(int[] arr){
     for(int i=0; i<arr.length; i++){
        for(int j=1; j<arr.length; j++){
            if(arr[j]< arr[j-1] ){
                int temp = arr[j];
                arr[j] = arr[j-1];
                arr[j-1] = temp;            
            }
        }
     }

     for(int i=0; i<arr.length; i++)
     {
         System.out.print(arr[i] + " ");
     }
}

}

//main class

import java.util.Scanner;

public class Main
{

   
    public static void main(String[] args)
    {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the size of the array: ");
        int n = input.nextInt();
        int[] x = new int[n];

        System.out.print("Enter "+ n +" numbers: ");
        for(int i=0; i<n; i++)
        {
            x[i] = input.nextInt();
        }
        
        BubbleSort access = new  BubbleSort();
 System.out.print("The Sorted numbers: ");
        access.bubbleSort(x);
    }

}

Reverse string Or Print String Backward using Recursion

public class StringBackward
{
    public static void reverseString(String word, int size)
    {
       if(size==0)
       {
           return;
       }
       else
       {
          System.out.print(word.charAt(size-1));
          reverseString(word, size-1);
       }
    }

}

//main class

import java.util.Scanner;

public class Main {

    public static void main(String[] args)
    {
      Scanner input = new Scanner(System.in);

       String word;
       System.out.print("Enter a word: ");
       word = input.next();

        StringBackward access = new  StringBackward();
        System.out.print("The reverse word is: ");
        access.reverseString(word, word.length());
        System.out.println();

    }

}

How to Sort Numbers using Selection Sort

public class SelectionSort
{

     public void SelectionSort(int[] arr){
     for(int i=0; i<arr.length; i++)
     {
        for(int j=i+1; j<arr.length; j++)
        {
            if(arr[i] > arr[j] )
            {
                int temp = arr[j];
                arr[j] = arr[i];
                arr[i] = temp;
            }
        }
     }

     for(int i=0; i<arr.length; i++)
     {
         System.out.print(arr[i] + " ");
     }
}

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the size of the array: ");
        int n = input.nextInt();
        int[] x = new int[n];

        System.out.print("Enter "+ n +" numbers: ");
        for(int i=0; i<n; i++)
        {
            x[i] = input.nextInt();
        }

        SelectionSort access = new  SelectionSort();
        System.out.print("The Sorted numbers: ");
        access.SelectionSort(x);
    }

}

Add Numbers inside an Array Using Recursion

public class Array
{
    public static int array( int[] arr, int first, int last)
    {
      //  int sum = 0;
        if(arr[first] == arr[last])/* must be if(first == last),but try this one too, study the code, it is interesting */
        {
           return arr[first];
        }
        else
        {  
           return arr[first] + array(arr, first+1, last);
             
        }
       
    }
   

}

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the size of the input you want to enter: ");
        int size = input.nextInt();
        int[] numArr = new int[size];

        System.out.print("Enter "+ size +" numbers: ");
        for(int i=0; i<numArr.length; i++)
        {
          numArr[i]=input.nextInt();
        }

        System.out.print("The sum of the numbers is: "+   Array.array(numArr, 0 , size-1) );
            

    }
}

Add Numbers inside an Array using For Loop

import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the size of the input you want to enter: ");
        int size = input.nextInt();
        int[] numArr = new int[size];
        int sum=0;
        
 System.out.print("Enter "+ size +" numbers: ");
        
 for(int i=0; i<numArr.length; i++)
        {
          numArr[i]=input.nextInt();
          sum = sum + numArr[i];
        }
    
        System.out.print("The sum of the numbers is: " + sum);
    }
}

Sample Output:
Enter the size of the input you want to enter: 5
Enter 5 numbers: 34 2 5 3 6
The sum of the numbers is: 50
If you want to make a method and segregate the implementation of sum for the sake of practice in Object Oriented Programming, just simply code it this way.

//java class

public class ArraySum
{
    public int sumOfArray(int[] array)
    {
        int sum = 0;
        for(int i=0; i<array.length; i++)
        {
            sum = sum + array[i];
        }

        return sum;
    }
}

//main class


import java.util.Scanner;

public class Main
{

    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the size of the input you want to enter: ");
        int size = input.nextInt();
        int[] numArr = new int[size];
        
        System.out.print("Enter "+ size +" numbers: ");
        for(int i=0; i<numArr.length; i++)
        {
          numArr[i]=input.nextInt();
         
        }

        ArraySum access = new ArraySum();
        System.out.print("The sum of the numbers is:" + access.sumOfArray(numArr));        

    }
}

print/draw Diamond Shape using Asterisk in java

public class Diamond
{
    public String Diamond_Asterisk(int num)
    {
        if(num>0)
        {
            return "*-" + Diamond_Asterisk(num-1);
        }
        else
        {
            return "-";
        }
    }
     public String Diamond_Asterisk2(int num)
    {
        if(num>0)
        {
            return "-*-" + Diamond_Asterisk(num-1);
        }
        else
        {
            return "-";
        }
    }

    public String Space(int num)
    {
        if(num>0)
        {
            return "-" + Space(num-1);
        }
        else
        {
            return "-";
        }
    }
    public void DiamondResult(int num)
    {
        for(int i=1; i<num; i++)
        {
            System.out.print(Space(num-i));
             System.out.println(Diamond_Asterisk(i));
            
        }
         for(int i=0; i<num; i++)
        {
            System.out.println(Diamond_Asterisk2(num-i));
            System.out.print(Space(i));

        }
     
    }
    

}


//main class


import java.util.Scanner;

public class Main {

    public static void main(String[] args) 
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int num = input.nextInt();

        Diamond access = new Diamond();
        System.out.println("The shape for this is: ");
        access.DiamondResult(num);
        
    }

}

===================================

Sample Output 1:
Enter a number: 3
The shape for this is:
---*--
--*-*--
-*-*-*--
--*-*--
---*--
Sample Output 2:
Enter a number: 4
The shape for this is:
----*--
---*-*--
--*-*-*--
-*-*-*-*--
--*-*-*--
---*-*--
----*--

Print Different Asterisk Shapes in java

//main method
public class Main{
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int n = input.nextInt();
Asterisk1 access = new Asterisk1();
access.asterisk2(n);
}
}
//java class
public class Asterisk1 {
private int count = 0;
public void asterisk1(int n) {
if(n==0) {
System.out.println();
}
else {
System.out.print("*");
asterisk1(n-1); } }
public void asterisk2( int n) {
if(n==0){
return; }
else {
asterisk1(n);
asterisk2(n-1);
}
}
}

This program will output the asterisk in this form. If the number 4 is entered the form will be like this.
****
***
**
*
2. A Java source code for another Asterisk Form

/*The following code will have the same method as the first but different in implementation*/ //main method
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int n = input.nextInt();
Asterisk1 access = new Asterisk1();
access.asterisk2(n,1);
}
}
// java class
public class Asterisk1 {
private int count = 0;
public void asterisk1(int n) {
if(n==0) {
System.out.println();
}
else {
System.out.print("*");
asterisk1(n-1);
}
}
public void asterisk3(int count,int m) {
if( count == 0) {
System.out.println();
} else {
asterisk1(m);
asterisk3(n-1,m+1);
}
}
}

The output of this code if number 4 is entered will be like this.
*
**
***
****

To get a form that would look like this,
****
***
**
*
*
**
***
****
3. Here is the other code.

//main method
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int n = input.nextInt();
Asterisk1 access = new Asterisk1();
access.asterisk2(n); access.asterisk3(n,1);
}
}
// java class
public class Asterisk1 {
private int count = 0;
public void asterisk1(int n) {
if(n==0) { System.out.println();
} else {
System.out.print("*");
asterisk1(n-1);
}
}
public void asterisk2( int n) {
if(n==0) {
return;
} else {
asterisk1(n);
asterisk2(n-1);
}
}
public void asterisk3( int n,int m)
{ if( n == 0) {
System.out.println();
} else {
asterisk1(m);
asterisk3(n-1,m+1);
}
}
}

4. Lastly, to acquire a shape like this,
*
**
***
****
****
***
**
*
here is the code:

//main method
package prog_proj2;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int n = input.nextInt();
Asterisk1 access = new Asterisk1();
access.asterisk3(n); access.asterisk2(n);
}
}
//java class
public class Asterisk1 {
private int count = 0;
public static void asterisk1(int n) {
if(n==0) { System.out.println();
} else {
System.out.print("*");
asterisk1(n-1);
}
}
public void asterisk2( int n) {
if(n==0) { return;
} else {
asterisk1(n);
asterisk2(n-1);
}
}
public void asterisk3( int n) {
count++;
if( n == 0) {
return;
} else {
asterisk1(count);
asterisk3(n-1);
}
}
}

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import java.io.*;
class FileRead
{
public static void main(String args[])
{
try{
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream("textfile.txt");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
// Print the content on the console
System.out.println (strLine);
}
//Close the input stream
in.close();
}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}
}

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Compare HashSet,TreeSet and ArrayList by Example

import java.util.*;
import java.math.*;
public class NoDupsTest
{
/* ---- HashSet approach (list order not maintained) ---- */
public static void test_HashSet(ArrayList a_master)
{
ArrayList a = new ArrayList(a_master);
long cur = System.currentTimeMillis();
HashSet h = new HashSet(a);
a.clear();
a.addAll(h);
long diff = System.currentTimeMillis()-cur;
System.out.println("HashSet approach (no order) = "+diff);
}

/* ---- TreeSet approach (list order not maintained, but sorted) ---- */
public static void test_TreeSet(ArrayList a_master)
{
ArrayList a = new ArrayList(a_master);
long cur = System.currentTimeMillis();
TreeSet t = new TreeSet(a);
a.clear();
Iterator iter = t.iterator();
while (iter.hasNext())
a.add(iter.next());
long diff = System.currentTimeMillis()-cur;
System.out.println(
"TreeSet approach (sorted order) = "+diff+" ms");
}

/* ---- ArrayList and HashSet approach (order maintained) ---- */
public static void test_HashSet_listOrder(ArrayList a_master)
{
ArrayList a = new ArrayList(a_master);
long cur = System.currentTimeMillis();
Set set = new HashSet();
List newList = new ArrayList();
for (Iterator iter = a.iterator(); iter.hasNext(); ) {
Object element = iter.next();
if (set.add(element))
newList.add(element);
}
a.clear();
a.addAll(newList);
long diff = System.currentTimeMillis()-cur;
System.out.println(
"ArrayList/HashSet approach (list order) = "+diff+" ms");
}

/* ---- ArrayList and TreeSet approach ---- */
public static void test_TreeSet_listOrder(ArrayList a_master)
{
ArrayList a = new ArrayList(a_master);
long cur = System.currentTimeMillis();
Set set = new TreeSet();
List newList = new ArrayList();
for (Iterator iter = a.iterator(); iter.hasNext(); ) {
Object element = iter.next();
if (set.add(element))
newList.add(element);
}
a.clear();
a.addAll(newList);
long diff = System.currentTimeMillis()-cur;
System.out.println(
"ArrayList/TreeSet approach (list order) = "+diff+" ms");
}

public static void main(String[] args)
{
int num = Integer.parseInt(args[0]);
int numUnique = Integer.parseInt(args[1]);
/* Create master list */
Random rnd = new Random();
ArrayList masterList = new ArrayList();
for (int i=0; i<num; i++) {
masterList.add(new Integer((Math.abs(rnd.nextInt())%numUnique)));
}
/* Run tests */
test_HashSet(masterList);
test_TreeSet(masterList);
test_HashSet_listOrder(masterList);
test_TreeSet_listOrder(masterList);
}
}

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Simple console print statement demonstration

public class ConsolePrintApplet1 extends java.applet.Applet
{
  public void init ()
  {

    // Put code between this line
    //------------------------------------------
    double x = 5.0;
    double y = 3.0;
    System.out.println ("x * y = " + (x*y));
    System.out.println ("x / y = " + (x/y));

    // and this line.
    //------------------------------------------
  }

  // Paint message in Applet window.
  public void paint (java.awt.Graphics g) {
     g.drawString ("ConsolePrintApplet1",10,20);
  }
}

public class ConsolePrintApp1 extends java.applet.Applet
{
  public static void main (String [] args) {
    // Put code between this line
    //------------------------------------------

    double x = 5.0;
    double y = 3.0;
    System.out.println ("x * y = " + (x*y));
    System.out.println ("x / y = " + (x/y));

    //------------------------------------------
    // and this line.
  }

}

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Hashtable in java

// Demonstrate a Hashtable
import java.util.*;
class HTDemo {
public static void main(String args[]) {
Hashtable balance = new Hashtable();
Enumeration names;
String str;
double bal;
balance.put("John Doe", new Double(3434.34));
balance.put("Tom Smith", new Double(123.22));
balance.put("Jane Baker", new Double(1378.00));
balance.put("Todd Hall", new Double(99.22));
balance.put("Ralph Smith", new Double(-19.08));
// Show all balances in hash table.
names = balance.keys();
while(names.hasMoreElements()) {
str = (String) names.nextElement();
System.out.println(str + ": " +
balance.get(str));
}
System.out.println();
// Deposit 1,000 into John Doe's account
bal = ((Double)balance.get("John Doe")).doubleValue();
balance.put("John Doe", new Double(bal+1000));
System.out.println("John Doe's new balance: " +
balance.get("John Doe"));
}
}

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