Free Oracle 1Z0-809 Exam Questions

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. import java.util.stream.Stream;

4.  

5. public class Test {

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

7.         Stream stream = Stream.of("d", "cc", "bbb", "aaaa");

8.         stream.sorted().forEach(System.out::println);

9.     }

10. }

Which of the following needs to be done, so that output is: 

d

cc

bbb

aaaa

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. import java.util.Arrays;

4. import java.util.List;

5. import java.util.function.Predicate;

6.  

7. public class Test {

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

9.         List list = Arrays.asList(-80, 100, -40, 25, 200);

10.         Predicate predicate = num -> {

11.             int ctr = 1;

12.             boolean result = num > 0;

13.             System.out.print(ctr++ + ".");

14.             return result;

15.         };

16.         

17.         list.stream().filter(predicate).findFirst();

18.     }

19. }

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

Below is the code of Test.java file:

1. package com.udayan.ocp;

2.  

3. class Outer {

4.     static class Inner {

5.         static void greetings(String s) {

6.             System.out.println(s);

7.         }

8.     }

9. }

10.  

11. public class Test {

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

13.         /*INSERT*/

14.     }

15. }

Which of the following 2 options can replace /*INSERT*/ such that there on executing class Test, output is: HELLO!?

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. public class Test {

4.     private static String msg = "Hello";

5.  

6.     private static String changeMsg(String m) {

7.         msg = m;

8.         return null;

9.     }

10.  

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

12.         if(args.length == 0) {

13.             assert false : changeMsg("Bye");

14.         }

15.         System.out.println(msg);

16.     }

17. }

What will be the result of executing Test class with below command? 

java -ea com.udayan.ocp.Test

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

1. package com.udayan.ocp;

2.  

3. class X {

4.     class Y {

5.         private void m() {

6.             System.out.println("INNER");

7.         }

8.     }

9.     

10.     public void invokeInner() {

11.         Y obj = new Y(); //Line 9

12.         obj.m(); //Line 10

13.     }

14. }

15.  

16. public class Test {

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

18.         new X().invokeInner();

19.     }

20. }