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) }}

3 and 4

1 and 3

2 and 3

1 and 2

4 and 5

3 and 4

1 and 3

2 and 3

1 and 2

4 and 5

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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()); }}

Compilation succeed but Runtime Exception

test-name

Compilation fails due to an error on lines 2

Compilation fails due to an error on lines 1

None of these

Compilation succeed but Runtime Exception

test-name

Compilation fails due to an error on lines 2

Compilation fails due to an error on lines 1

None of these

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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.

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
In Java, declaring a class abstract is useful

When it makes sense to have objects of that class.

When default implementations of some methods are not desirable.

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

To prevent developers from further extending the class.

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

When it makes sense to have objects of that class.

When default implementations of some methods are not desirable.

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

To prevent developers from further extending the 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 is a correct interface?

interface A { void print() { } }

interface A { void print(); }

abstract interface A { abstract void print(); { }}

abstract interface A { print(); }

interface A { void print() { } }

interface A { void print(); }

abstract interface A { abstract void print(); { }}

abstract interface A { print(); }

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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();

1 and 3

3 and 4

2 and 3

2 and 4

1 and 2

1 and 3

3 and 4

2 and 3

2 and 4

1 and 2

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JAVA Interfaces and Abstract Classes

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()); }}

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 In Java, declaring a class abstract is useful

JAVA Interfaces and Abstract Classes Which of the following is a correct interface?

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
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()); }}

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
In Java, declaring a class abstract is useful

JAVA Interfaces and Abstract Classes
Which of the following is a correct interface?

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();