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

Consider the code of Greet.java file:

1. package com.udayan.ocp;

2.  

3. public final class Greet {

4.     private String msg;

5.     public Greet(String msg) {

6.         this.msg = msg;

7.     }

8.  

9.     public String getMsg() {

10.         return msg;

11.     }

12.  

13.     public void setMsg(String msg) {

14.         this.msg = msg;

15.     }

16. }

Is Greet class an immutable class?

Which of the following code will create/return a Locale object for the JVM, on which your code is running?

Given code of Test.java file:

package com.udayan.ocp;

import java.util.Arrays;

import java.util.List;

public class Test {

    public static void main(String[] args) {

        List list = Arrays.asList("A", "E", "I", "O");

        list.add("U");

        list.forEach(System.out::print);

    }

}

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

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