MCQ's on Java Fundamentals

1. Which is a valid keyword in java?

A. interface
B. Float
C. string
D. unsigned
Click for answer 
A. interface

2. Which is a reserved word in the Java programming language?

A. method
B. array
C. native
D. reference
D. subclasses
Click for answer 
C. native

3. Which will legally declare, construct, and initialize an array?

A. int [] myList = {"1", "2", "3"};
B. int [] myList = (5, 8, 2);
C. int myList [] [] = {4,9,7,0};
D. int myList [] = {4, 3, 7};
Click for answer 
D. int myList [] = {4, 3, 7};

4. Which three are legal array declarations?

1. int [] myScores [];
2. char [] myChars;
3. int [6] myScores;
4. Dog myDogs [];
5. Dog myDogs [7];

A. 1,2,4
B. 2,4,5
C. 2,3,4
D. All are correct.
Click for answer 
A. 1,2,4

5. Which one of the following will declare an array and initialize it with five numbers?

A. Array a = new Array(5);
B. int [] a = {23,22,21,20,19};
C. int a [] = new int[5];
D. int [5] array;
Click for answer 
B. int [] a = {23,22,21,20,19};

6. Which three are valid declarations of a char?
1. char c1 = 064770;
2. char c2 = 'face';
3. char c3 = 0xbeef;
4. char c4 = \u0022;
5. char c5 = '\iface';
6. char c6 = '\uface';

A. 1,2,4
B. 1,3,6
C. 3,5,2
D. 4,1,6
Click for answer 
B. 1,3,6

7. Which is the valid declarations within an interface definition?

A. public double methoda();
B. public final double methoda();
C. static void methoda(double d1);
D. protected void methoda(double d1);
Click for answer 
A. public double methoda();

8. Which one is a valid declaration of a boolean?

A. boolean b1 = 0;
B. boolean b2 = 'false';
C. boolean b3 = false;
D. boolean b4 = Boolean.false();
E. boolean b5 = no;
Click for answer 
B. 1,3,6

9. Which three are valid declarations of a float?

1. float f1 = -343;
2. float f2 = 3.14;
3. float f3 = 0x12345;
4. float f4 = 42e7;
5. float f5 = 2001.0D;
6. float f6 = 2.81F;

A. 1,2,4
B. 2,3,5
C. 1,3,6
D. 2,4,6
Click for answer 
C. 1,3,6

10. Which is a valid declarations of a String?

A. String s1 = null;
B. String s2 = 'null';
C. String s3 = (String) 'abc';
D. String s4 = (String) '\ufeed';
Click for answer 
A. String s1 = null;


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