JAVA Interfaces and Abstract Classes
Which of the following declares an abstract method in an abstract Java class?

public abstract void method() {}
public abstract method();
public void method() {}
public void abstract Method();
public abstract void method();

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JAVA Interfaces and Abstract Classes
Which of the following class definitions defines a legal abstract class?

public class abstract A { abstract void unfinished(); }
class A { abstract void unfinished(); }
abstract class A { abstract void unfinished(); }
class A { abstract void unfinished() { } }

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

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

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JAVA Interfaces and Abstract Classes
Given the following piece of code:public class School{ public abstract double numberOfStudent();}which of the following statements is true?

Class School must be defined abstract.
The keywords public and abstract cannot be used together.
You must add a return statement in method numberOfStudent().
The method numberOfStudent() in class School must have a body.

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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()); }}

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

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