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

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?

The method numberOfStudent() in class School must have a body.

You must add a return statement in method numberOfStudent().

Class School must be defined abstract.

The keywords public and abstract cannot be used together.

The method numberOfStudent() in class School must have a body.

You must add a return statement in method numberOfStudent().

Class School must be defined abstract.

The keywords public and abstract cannot be used together.

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

All of these

A subclass can override a concrete method in a superclass to declare it abstract.

A subclass of a non-abstract superclass can be abstract.

An abstract class can be extended.

An abstract class can be used as a data type.

All of these

A subclass can override a concrete method in a superclass to declare it abstract.

A subclass of a non-abstract superclass can be abstract.

An abstract class can be extended.

An abstract class can be used as a data type.

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JAVA Interfaces and Abstract Classes
Runnable is a _____ .

class

vaiable

interface

abstract class

method

class

vaiable

interface

abstract class

method

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JAVA Interfaces and Abstract Classes
Which two of the following are legal declarations for abstract classes and interfaces?1. final abstract class Test {}2. public static interface Test {}3. final public class Test {}4. protected abstract class Test {}5. protected interface Test {}6. abstract public class Test {}

3 and 5

1 and 2

2 and 4

5 and 6

3 and 6

3 and 5

1 and 2

2 and 4

5 and 6

3 and 6

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JAVA Interfaces and Abstract Classes
What is the output for the below code ?interface A{ public void printValue();}1. public class Test{2. public static void main (String[] args){3. A a1 = new A(){4. public void printValue(){5. System.out.println("A");6. }7. };8. a1.printValue();9. }10. }

A

null

Compilation fails due to an error on line 8

None of these

Compilation fails due to an error on line 3

A

null

Compilation fails due to an error on line 8

None of these

Compilation fails due to an error on line 3

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JAVA Interfaces and Abstract Classes
interface Test{ int p = 10; //line 1 public int q = 20; //line 2 public static int r = 30; //line 3 public static final int s = 40; //line 4}Which of the above line will give compilation error?

4

3

1

2

None of these

4

3

1

2

None of these

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JAVA Interfaces and Abstract Classes

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?

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

JAVA Interfaces and Abstract Classes Runnable is a _____ .

JAVA Interfaces and Abstract Classes What is the output for the below code ?interface A{ public void printValue();}1. public class Test{2. public static void main (String[] args){3. A a1 = new A(){4. public void printValue(){5. System.out.println("A");6. }7. };8. a1.printValue();9. }10. }

JAVA Interfaces and Abstract Classes interface Test{ int p = 10; //line 1 public int q = 20; //line 2 public static int r = 30; //line 3 public static final int s = 40; //line 4}Which of the above line will give compilation error?

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?

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

JAVA Interfaces and Abstract Classes
Runnable is a _____ .

JAVA Interfaces and Abstract Classes
What is the output for the below code ?interface A{ public void printValue();}1. public class Test{2. public static void main (String[] args){3. A a1 = new A(){4. public void printValue(){5. System.out.println("A");6. }7. };8. a1.printValue();9. }10. }

JAVA Interfaces and Abstract Classes
interface Test{ int p = 10; //line 1 public int q = 20; //line 2 public static int r = 30; //line 3 public static final int s = 40; //line 4}Which of the above line will give compilation error?