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Q:

Why interface data is public?

Answer

to access non-public data outside class getter methods be defined but we cannot define a  method inside interface we can declared a method inside interface.

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Subject: Java

Q:

Why interface data is final?

Answer

bcoz interface does not contains any initializers and constructors to initialize its data members.

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Subject: Java

Q:

Why interface data is static?

Answer

Interface data is static data why bcoz interface supports multiple inheritance.


if inteface data is non-static then there is chance for replication of the data (bcoz of replication of data ambiguity problem occurs )

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Subject: Java

Q:

What is abstract method?

Answer

abstract method is a method declared with abstract modifier but  with out body.

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Subject: Java

Q:

What is the use of tostring() method?

Answer

If we print any object by using println() or print() methods.


The println() or print() methods internally calls tostring() method and prints the return value of toString() method.

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Subject: Java

Q:

What is the purpose of overriding toString() method?

Answer

we can override tostring() method to return String representation of our object data

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Subject: Java

Q:

What is final method?

Answer

Final method is a method defined in the super class with final modifier.


We cannot overriding final method of super class in the sub class.


EX:


 Class Sample {


   final void funOne() {


   }


   void funTwo() {


   }


}


Class Sub extends Sample {


  void funOne() { // overriding is not allowed


  }


  viod funTwo() { //overriding is allowed


  }


}

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Subject: Java

Q:

What is the use of overloading ? or why overloading?

Answer

By using overloading we can add new functionality to the sub class.

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Subject: Java