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); }}

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); }}

Successful run and print 37

Compilation error due to line 2

None of these

Runtime error

Compilation error due to line 1

Successful run and print 37

Compilation error due to line 2

None of these

Runtime error

Compilation error due to line 1

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

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

To prevent developers from further extending the class.

When default implementations of some methods are not desirable.

When it makes sense to have objects of that class.

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

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

To prevent developers from further extending the class.

When default implementations of some methods are not desirable.

When it makes 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
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 3

3 and 4

2 and 4

1 and 3

1 and 2

2 and 3

3 and 4

2 and 4

1 and 3

1 and 2

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JAVA Interfaces and Abstract Classes
What will be the output for the below code ?public interface TestInf{ int i =10;}public class Test{ public static void main(String... args){ TestInf.i=12; System.out.println(TestInf.i); }}

Runtime Exception

Compile with error

10

12

None of these

Runtime Exception

Compile with error

10

12

None of these

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

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

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

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 in the declaration of class Dog we must use the keyword extends instead of implements.

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

This code will compile without any errors.

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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 {}

5 and 6

3 and 6

1 and 2

2 and 4

3 and 5

5 and 6

3 and 6

1 and 2

2 and 4

3 and 5

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JAVA Interfaces and Abstract Classes

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

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 for the below code ?public interface TestInf{ int i =10;}public class Test{ public static void main(String... args){ TestInf.i=12; System.out.println(TestInf.i); }}

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
In Java, declaring a class abstract is useful

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 for the below code ?public interface TestInf{ int i =10;}public class Test{ public static void main(String... args){ TestInf.i=12; System.out.println(TestInf.i); }}

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?