JavaQuizzes

Multiple Choice Question

Which of the following statements are true?

Select 1 option

A. For any non-null reference obj, the expression (obj instanceof obj) will always yield true.

B. For any non-null reference obj, the expression (obj instanceof Object) will always yield true.

C. For any non-null reference obj, the expression (obj instanceof obj) will always yield false.

D. For any non-null reference obj, the expression (obj instanceof Object) may yield false.

E. None of the above

Multiple Choice Question

Given:

class HelloWorld{

  public static void main (String[] args)
  {
    System.out.println("Hello World!");
  }

}

Select 1 option below, if the above class is declared in a file Hello.java:

A. Compilation will fail

B. Compilation succeeds, but execution fails with an exception

C. Compilation and execution succeeds and it prints 'Hello World!'

D. Compilation and execution succeeds and it prints nothing.

Multiple Choice Question

Given:

public class HelloWorld{

  public static void main (String[] args)
  {
    System.out.println("Hello World!");
  }

}

Select 1 option below, if the above class is declared in a file Hello.java:

A. Compilation will fail

B. Compilation succeeds, but execution fails with an exception

C. Compilation and execution succeeds and it prints 'Hello World!'

D. Compilation and execution succeeds and it prints nothing.

Multiple Choice Question

Given:

class HelloWorld{

  public static void main (String[] args)
  {
    System.out.println("Hello"+1*2+3);
  }

}

A. Compilation fail

B. Compilation succeeds, but execution will fail with an exception

C. Compile and run successfully and print Hello23

D. Compile and run successfully and print Hello123

Multiple Choice Question

Given:

class HelloWorld{

  public static void main (String[] args)
  {
    System.out.println("Hello"+1+3-2);
  }

}

A. Compilation fail

B. Compilation succeeds, but execution will fail with an exception

C. Compile and run successfully and print Hello123

D. Compile and run successfully and print Hello11

Multiple Choice Question

Given:

class HelloWorld{

  public static void main (String[] args)
  {
    System.out.println("Hello"+1+3-2);
  }

}

A. Compilation fail

B. Compilation succeeds, but execution will fail with an exception

C. Compile and run successfully and print Hello123

D. Compile and run successfully and print Hello11

Multiple Choice Question

Which of these array declarations and initializations are NOT legal?

 

Select 2 options

A. int[ ] i[ ] = { { 1, 2 }, { 3 }, { }, { 4, 5, 6 } } ;

B. int i[ ] = new int[2] {1, 2} ;

C. int i[ ][ ] = new int[ ][ ] { {1, 2, 3}, {4, 5, 6} } ;

D. int i[ ][ ] = { { 1, 2 }, new int[ 2 ] } ;

E. int i[4] = { 1, 2, 3, 4 } ;

Multiple Choice Question

Which of the following code fragments will successfully initialize a two-dimensional array of chars named cA with a size such that cA[2][3] refers to a valid element?

1. char[][] cA = { { 'a', 'b', 'c' }, { 'a', 'b', 'c' } };

2. char cA[][] = new char[3][];

       for (int i=0; i<cA.length; i++) cA[i] = new char[4];

3.char cA[][] = { new char[ ]{ 'a', 'b', 'c' } , new char[ ]{   'a', 'b', 'c' } };

4char cA[3][2] = new char[][] { { 'a', 'b', 'c' }, { 'a', 'b','c' } };

5.char[][] cA = { "1234", "1234", "1234" };

 

Select 1 option

A. 1, 3

B. 4, 5

C. 2, 3

D. 1, 2, 3

E. 2

Multiple Choice Question

What will the following program print?

class Test{

public static void main(String[] args){

int i = 4;

int ia[][][] = new int[i][i = 3][i];

System.out.println( ia.length + ", " + ia[0].length+", "+ ia[0][0].length);

}

}

Select 1 option

A. It will not compile.

B. 3, 4, 3

C. 3, 3, 3

D. 4, 3, 4

E. 4, 3, 3

Multiple Choice Question

What will happen when the following code is compiled and run?

class AX{

static int[] x = new int[0];

static{

x[0] = 10;

}

public static void main(String[] args){

AX ax = new AX();

}

}

Select 1 option

A. It will throw NullPointerException at runtime.

B. It will throw ArrayIndexOutOfBoundsException at runtime.

C. It will throw ExceptionInInitializerError at runtime.

D. It will not compile.

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