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 interface Guard{ void doYourJob();}abstract public class Dog implements Guard{ }which of the following statements is correct?

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.

This code will compile without any errors.

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

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

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

An abstract class can be used as a data type.

All of these

An abstract class can be extended.

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 used as a data type.

All of these

An abstract class can be extended.

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

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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. }

None of these

Compilation fails due to an error on line 3

null

A

Compilation fails due to an error on line 8

None of these

Compilation fails due to an error on line 3

null

A

Compilation fails due to an error on line 8

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JAVA Interfaces and Abstract Classes
What will be the output when the following program is compiled and executed?abstract class TestAbstract{ String my_name; String myName(){ my_name = "Examveda"; return my_name; } abstract void display();}public class Test extends TestAbstract{ void display(){ String n = myName(); System.out.print("My name is "+ n); } public static void main(String args[]){ Test t = new Test(); t.display(); }}

Program will compile and execute successfully and prints

Compilation error occurs as the abstract class TestAbstract contains a non-abstract method.

None of these

Compilation error as class can not be declared as abstract.

Program compiles but leads to runtime exception.

Program will compile and execute successfully and prints

Compilation error occurs as the abstract class TestAbstract contains a non-abstract method.

None of these

Compilation error as class can not be declared as abstract.

Program compiles but leads to runtime exception.

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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 2

3 and 4

1 and 3

2 and 3

2 and 4

1 and 2

3 and 4

1 and 3

2 and 3

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

class A { abstract void unfinished() { } }

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

class A { abstract void unfinished(); }

abstract class A { abstract void unfinished(); }

class A { abstract void unfinished() { } }

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

class A { abstract void unfinished(); }

abstract class A { abstract void unfinished(); }

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JAVA Interfaces and Abstract Classes

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 Which of the following statements regarding abstract classes are true?

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 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 Which of the following class definitions defines a legal abstract class?

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
Which of the following statements regarding abstract classes are true?

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
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
Which of the following class definitions defines a legal abstract class?