Java Array Quiz

Which of the following Array declaration statement is illegal?

• int [ ] a [ ] = new int [4] [4];

• int a[ ][ ] = new int [4] [4];

• int a[ ] [ ] = new int [ ] [4];

• int [ ] a [ ] = new int [4] [ ];

What will happen if you try to compile and run the following code ? public class Test { public static void main (String args[]) { int[] arr = new int [] {1,2,3}; System.out.println(arr[1]); } }

• 1

• Error: arr is referenced before it is initialized

• 2

• Error: size of array must be defined

In the given Array declaration, which expression returns the output as 5? int [] arr = { 23, 5, 78, 34, 2};

• arr.length()

• arr[].length()

• arr[].length

• arr.length

What will be the output upon the execution of the following code ? public class Test { public static void main(String[] args) { int j = 5; for (int i = 0; i< j; i++) { if ( i <= j-- ) System.out.print( (i*j) + " "); } } }

• 0 3 2

• 1 2 3

• 0 3 4

• 1 4 2

Which declaration of the main() method is valid ?

• public void main( String args [] )

• public void static main( String args [] )

• final public static void main(String[] arr)

• public static void main( String[] arr)

What will be the output of the following code ? public class Test { public static void main(String[] args) { double d = 100.04; float f = d; System.out.println("Float value "+f); } }

• 100.04

• 100.0

• Compilation Error (lossy conversion from double to float)

• 100

Is it possible in Java to create arrays of length zero ?

• Yes, you can create arrays of any type with length zero.

• No, it is not possible to create arrays of length zero in Java.

What is the output of the following code fragments?

int [] fun = new int [5];

fun [0] = 1;

fun [1] = 2;

fun [2] = 3;

fun [3] = 4;

fun [4] = 5;

int j = 3;

System.out.println(fun [ j-1]);

• 1

• 2

• 3

What is the output of the following code fragment?

int [ ] odd = {1, 3, 5, 7, 9, 11 };

System.out.println( odd[0] + " " + odd[3] ) ;

• 1 5

• 6

• 1 7

• 8

What does the following method do?

public static void numbers (int [ ] num) {

for(int x = 1; x < num.length; x++)

num[x] = num[0];

}

• It copies what is in cell 0 into all other cells.

• It changes every element to the value of x.

• It copies 0 into every element.

• It puts the array into numerical ascending order.