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Java Interview Questions on Interfaces - 6

Question: 1

which class or interface defines wait(), notify() and notifyall() methods

(A) Thread
(B) Object
(C) Runnable
(D) Class

Level: Practitioner Category: interfaces
[Posted by: Admin | Chicago, USA]

Question: 2

Can we define main() method inside abstract class?

(A) Yes
(B) No

Level: Practitioner Category: interfaces
[Posted by: Admin | Chicago, USA]

Question: 3

What is output of below code?

abstract public class Main
{
    public static void main(String[] args) {
        System.out.println("Hello CppBuzz");
    }
}

(A) Compilation Error
(B) Hello CppBuzz
(C) 13
(D) Hello CppBuzz13

Level: Practitioner Category: interfaces
[Posted by: Admin | Chicago, USA]

Question: 4

Is it allowed to run below code when sum() is not defined and Main class is not inherited? What is the output of below code?

abstract public class Main
{
    abstract public void sum(int a, int b);
    
    public static void main(String[] args) {
	System.out.println("CppBuzz");
    }
}

(A) It is not allowed. Compilation Error
(B) It is allowed. CppBuzz
(C) It is allowed. Compilation Error
(D) None of the above

Level: Practitioner Category: interfaces
[Posted by: Admin | Chicago, USA]

Question: 5

What is abstract in Java?

(A) abstract is a keyword
(B) abstract is a method
(C) abstract is a class
(D) All of these

Level: Beginner Category: interfaces
[Posted by: Admin | Chicago, USA]

Question: 6

interface Rideable { String getGait(); }
public class Camel implements Rideable {
 int weight = 2;
 String getGait() { return " mph, lope"; }
 void go(int speed) {
 ++speed; weight++;
 int walkrate = speed * weight;
 System.out.print(walkrate + getGait());
 }
 public static void main(String[] args) {
 new Camel().go(8);
 }
}

(A) 16 mph, lope
(B) 24 mph, lope
(C) 27 mph, lope
(D) Compilation fails

Level: Practionar Category: interfaces
[Posted by: Admin | Chicago, USA]

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Java Interview Questions on Interfaces - 6

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