Free Online Oracle 1Z0-808 Practice Test

How many String objects are there in the HEAP memory, when control is at Line 9?

1. package com.udayan.oca;

2.  

3. public class Test {

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

5.          String s1 = new String("Java"); //Line 3

6.          String s2 = "JaVa"; //Line 4

7.          String s3 = "JaVa"; //Line 5

8.          String s4 = "Java"; //Line 6

9.          String s5 = "Java"; //Line 7

10.  

11.          int i = 1; //Line 9

12.  

13.      }

14. }

Consider below code:

1. package com.udayan.oca;

2.  

3. public class Test {

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

5.         StringBuilder sb = new StringBuilder();

6.         try {

7.             for(;;) {

8.                 sb.append("OCA");

9.             }

10.         } catch(Exception e) {

11.             System.out.println("Exception!!!");

12.         }

13.         System.out.println("Main ends!!!");

14.     }

15. }

What will be the result of compiling and executing Test class?

Given code of Thought.java file:

1. public class Thought {

2.     /*INSERT*/ {

3.         System.out.println("All is well");

4.     }

5. }

Which 3 options, if used to replace /*INSERT*/, will compile successfully and on execution will print "All is well" on to the console?

Consider below code of Test.java file:

1. package com.sampleproject.oca;

2.  

3. public class Test {

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

5.         int i = 1;

6.         int j = 5;

7.         int k = 0;

8.         A: while(true) {

9.             i++;

10.             B: while(true) {

11.                 j--;

12.                 C: while(true) {

13.                     k += i + j;

14.                     if(i == j)

15.                         break A;

16.                     else if (i > j)

17.                         continue A;

18.                     else 

19.                         continue B;

20.                 }

21.             }

22.         }

23.         System.out.println(k);

24.     }

25. }

What will be the result of compiling and executing Test class?

Consider below code of Test.java file:

1. package com.sampleproject.oca;

2.  

3. interface Perishable1 {

4.     default int maxDays() {

5.         return 1;

6.     }

7. }

8.  

9. interface Perishable2 extends Perishable1 {

10.     default int maxDays() {

11.         return 2;

12.     }

13. }

14.  

15. class Milk implements Perishable2, Perishable1 {}

16.  

17. public class Test {

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

19.         Perishable1 obj = new Milk();

20.         System.out.println(obj.maxDays());

21.     }

22. }

Which of the following statements is correct?