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

Compilation fails due to an error on lines 1
None of these
test-name
Compilation fails due to an error on lines 2
Compilation succeed but Runtime Exception

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JAVA Interfaces and Abstract Classes
What will happen after compiling this program code?abstract class MyClass{ //line 1 private int a, b; public void call(int a, int b){ this.a = a; this.b = b; System.out.print(a+b); }}public class Test{ public static void main(String args[]){ MyClass m = new MyClass(); //line 2 m.call(12,25); }}

Successful run and print 37
Compilation error due to line 2
Compilation error due to line 1
None of these
Runtime error

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JAVA Interfaces and Abstract Classes
In Java, declaring a class abstract is useful

To force developers to extend the class not to use its capabilities.
When default implementations of some methods are not desirable.
To prevent developers from further extending the class.
When it makes sense to have objects of that class.
When it doesn't make sense to have objects of that class.

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JAVA Interfaces and Abstract Classes
Which of the following statements regarding abstract classes are true?

An abstract class can be used as a data type.
A subclass can override a concrete method in a superclass to declare it abstract.
An abstract class can be extended.
All of these
A subclass of a non-abstract superclass can be abstract.

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