In Java, declaring a class abstract is useful Options: A . &nbspTo prevent developers from further extending the class. B . &nbspWhen it doesn't make sense to have objects of that class. C . &nbspWhen default implementations of some methods are not desirable. D . &nbspTo force developers to extend the class not to use its capabilities. E . &nbspWhen it makes sense to have objects of that class.

In Java, declaring a class abstract is useful

Question

In Java, declaring a class abstract is useful

Options:

A . To prevent developers from further extending the class.

B . When it doesn't make sense to have objects of that class.

C . When default implementations of some methods are not desirable.

D . To force developers to extend the class not to use its capabilities.

E . When it makes sense to have objects of that class.

Answer: Option B

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Question 1. What will be the output? interface A{ public void method(); } class One{ public void method(){ System.out.println("Class....extends Two{ public static void main(String[] args){ A a = new Two(); a.method(); } }

Question 2. Interface Base{ boolean m1 (); byte m2(short s); } which two code fragments will compile? 1. interface Base2 implements ....implements Base { protected boolean m1(){ return (5 > 7) }}

Question 3. Which two of the following are legal declarations for abstract classes and interfaces? 1. final abstract class Test {} 2....{} 5. protected interface Test {} 6. abstract public class Test {}

Question 4. What will happen after compiling this program code? abstract class MyClass{ //line 1 private int a, b; public void call(....static void main(String args[]){ MyClass m = new MyClass(); //line 2 m.call(12,25); } }

Question 5. Interface Test{ int p = 10; //line 1 public int q = 20; //line 2 public static int r = 30; //line 3 public static final ....//line 4 } Which of the above line will give compilation error?

Question 6. Runnable is a _____ .....

Question 7. What is the output for the below code ? interface A{ public void printValue(); } 1. public class Test{ 2. public static ....A(){ 4. public void printValue(){ 5. System.out.println("A"); 6. } 7. }; 8. a1.printValue(); 9. } 10. }

Question 8. What will be the output for the below code ? public interface TestInf{ int i =10; } public class Test{ public static voi....interface TestInf{ int i =10; } public class Test{ public static void main(String... args){ TestInf.i=12; System.out.println(TestInf.i); } }

Question 9. What will be the output? 1. public interface InfA{ 2. protected String getName(); 3. } public class Test implements InfA...."test-name"; } public static void main (String[] args){ Test t = new Test(); System.out.println(t.getName()); } }

Question 10. What happens if the following program is compiled and executed? interface MyInterface{ void display(); } interface MySub....to Examveda."); } public static void main(String args[]){ Test t = new Test(); t.display(); } }

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