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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));
    }

}

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How to get day month year in date

How to find Week of Year

How to get Day of Week in Month

How to Add or Subtract Date

find Week of Month in java

find Day of Year in Java

How to Create file in Java

SortedSet Example

Remove elements from SortedMap

Remove elements from SortedSet

Remove elements from Set

Remove elements from Map

Remove Element from ArrayList

Remove elements from List

List Example in java

Greatest Common Divisor or GCD using Recursion in java

Recursive function for X to the power Y

Recursive Koch Snow Flakes in java

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

Binary Search Using Recursion in java

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