interface Base{ boolean m1 (); byte m2(short s);}which two code fragments will compile?1. interface Base2 implements Base {}2. abstract class Class2 extends Base { public boolean m1(){ return true; }}3. abstract class Class2 implements Base {}4. abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }}5. abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}

JAVA Interfaces and Abstract Classes
interface Base{ boolean m1 (); byte m2(short s);}which two code fragments will compile?1. interface Base2 implements Base {}2. abstract class Class2 extends Base { public boolean m1(){ return true; }}3. abstract class Class2 implements Base {}4. abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }}5. abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}

1 and 2

1 and 3

3 and 4

4 and 5

2 and 3

1 and 2

1 and 3

3 and 4

4 and 5

2 and 3

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JAVA Interfaces and Abstract Classes
Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?1. A a = new A();2. A a = new B();3. B b = new A();4. B b = new B();

2 and 4

1 and 3

1 and 2

2 and 3

3 and 4

2 and 4

1 and 3

1 and 2

2 and 3

3 and 4

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JAVA Interfaces and Abstract Classes
Given the following piece of code:public interface Guard{ void doYourJob();}abstract public class Dog implements Guard{ }which of the following statements is correct?

This code will compile without any errors.

This code will not compile, because method doYourJob() in interface Guard must be defined abstract.

This code will not compile, because class Dog must implement method doYourJob() from interface Guard.

This code will not compile, because in the declaration of class Dog we must use the keyword extends instead of implements.

This code will compile without any errors.

This code will not compile, because method doYourJob() in interface Guard must be defined abstract.

This code will not compile, because class Dog must implement method doYourJob() from interface Guard.

This code will not compile, because in the declaration of class Dog we must use the keyword extends instead of implements.

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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?

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

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.

Class School must be defined abstract.

The keywords public and abstract cannot be used together.

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

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JAVA Interfaces and Abstract Classes
What happens if the following program is compiled and executed?interface MyInterface{ void display();}interface MySubInterface extends MyInterface{ void display();}public class Test implements MySubInterface{ public void display(){ System.out.print("Welcome to Examveda."); } public static void main(String args[]){ Test t = new Test(); t.display(); }}

The code will lead to a compilation error as the display method is not declared as abstract.

The code will lead to a compilation error due to public modifier while declaring the display method.

The code will lead to a compilation error as declaration of the display method has been provided in two interface.

The code will compile and execute successfully showing the output Welcome to Examians.

None of these

The code will lead to a compilation error as the display method is not declared as abstract.

The code will lead to a compilation error due to public modifier while declaring the display method.

The code will lead to a compilation error as declaration of the display method has been provided in two interface.

The code will compile and execute successfully showing the output Welcome to Examians.

None of these

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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); }}

None of these

Compilation error due to line 2

Runtime error

Successful run and print 37

Compilation error due to line 1

None of these

Compilation error due to line 2

Runtime error

Successful run and print 37

Compilation error due to line 1

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JAVA Interfaces and Abstract Classes

JAVA Interfaces and Abstract Classes Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?1. A a = new A();2. A a = new B();3. B b = new A();4. B b = new B();

JAVA Interfaces and Abstract Classes Given the following piece of code:public interface Guard{ void doYourJob();}abstract public class Dog implements Guard{ }which of the following statements is correct?

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
Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?1. A a = new A();2. A a = new B();3. B b = new A();4. B b = new B();

JAVA Interfaces and Abstract Classes
Given the following piece of code:public interface Guard{ void doYourJob();}abstract public class Dog implements Guard{ }which of the following statements is correct?

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?