Java Module 1 Quiz

• 2

• 1 2 3

• 1 2

• 2 3

• 5,6

• 5,5

• 6,5

• 6,6

• An exception is thrown at runtime.

  1 2 3

• No output is produced.

  1 2 3

• No output is produced.

  2 3 4

• No output is produced.

  1 2 3 4

Which of the following statements about Java arrays is true?

• Arrays can be multidimensional.

• Arrays can be resized dynamically.

• Arrays can store elements of different types.

• Arrays are immutable.

What is the output of the following code?

int[] arr1 = {1,2,3};

int[] arr2 = {4,5,6};

arr1 = arr2;

arr2[1] = 9;

System.out.println(arr1[1]);

• 6

• 9

• 2

• 5

Given:

22.  public void go() {

23.  String o = "";

24.  z:

25. for(int x = 0; x < 3; x++) {

26. for(int y = 0; y < 2; y++) {

27. if(x==1) break;

28. if(x==2 && y==1) break z;

29. o = o + x + y;

30. }

31. }

32.  System.out.println(o);

33. }

What is the result when the go() method is invoked?

• 00

• 0001

• 00012021

• 000120

• Compilation fails.

Given:

3.  public class Batman {

4.  int squares = 81;

5.  public static void main(String[] args) {

6.  new Batman().go(); 7. }

8.  void go() {

9.  incr(++squares);

10.  System.out.println(squares);

11. }

12.  void incr(int squares) { squares += 10; }

13. }

What is the result?

• 81

• 82

• 91

• 92

Given:

13.  public class Pass {

14.  public static void main(String [] args) {

15.  int x = 5;

16.  Pass p = new Pass();

17.  p.doStuff(x);

18.  System.out.print(" main x = " + x);

19. }

20.  void doStuff(int x) {

21.  System.out.print(" doStuff x = " + x++);

22. }

23. }

What is the result?

• doStuff x = 5 main x = 5

• doStuff x = 6 main x = 6

• doStuff x = 5 main x = 6

• doStuff x = 6 main x = 5

Which of the following variable argument method declaration is valid?

  

• m1(int x…)

• m1(int .x..)

• m1(int …x)  

• m1(int.. x)

What is the value of a[1] after the following code is executed?

int[] a = {0, 2, 4, 1, 3};

for(int i = 0; i < a.length; i++)

          a[i] = a[(a[i] + 3) % a.length];

• 1

• 2

• 3

• 0