Free Oracle 1Z0-808 Exam Questions

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

package com.udayan.oca;

public class Test {

     private static void add(double d1, double d2) {

         System.out.println("double version: " + (d1 + d2));

     }

     private static void add(Double d1, Double d2) {

        System.out.println("Double version: " + (d1 + d2));

     }

     public static void main(String[] args) {

         add(10.0, null);

     }

}

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

package com.udayan.oca;

public class Test {

     public static void main(String[] args) {

         String str1 = " ";

         boolean b1 = str1.isEmpty();

         System.out.println(b1);

         str1.trim();

         b1 = str1.isEmpty();

         System.out.println(b1);

     }

}

Given the code fragment:

Given the code fragment:

Consider below codes of 2 java files:

1. //Flyable.java

2. package com.sampleproject.oca;

3.  

4. public interface Flyable {

5.     static int horizontalDegree() { //Line n1

6.         return 20;

7.     }

8.  

9.     default void fly() {

10.         System.out.println("Flying at " + horizontalDegree() + " degrees."); //Line n2

11.     }

12.  

13.     void land();

14. }

1. //Aeroplane.java

2. package com.sampleproject.oca;

3.  

4. public class Aeroplane implements Flyable {

5.     public void land() {

6.         System.out.println("Landing at " + -Flyable.horizontalDegree() + " degrees."); //Line n3

7.     }

8.  

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

10.         new Aeroplane().fly();

11.         new Aeroplane().land();

12.     }

13. }

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