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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 different among String, StringBuffer, StringBuilder?

Answer

String class objects are immutable objects and they represents strings( sequence of characters)


StringBuffer class objects are mutable objects representing strings and they are Thread safe


StringBuild class objects are also mutable objects representing strings and they are not Thread safe

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Subject: Java

Q:

How to call argument constructor?

Answer

new ClassName( arg1, arg2, .... argN);


Ex:


Class sample {


   Sample(int a) {


   System.out.println("arg con a =" +a);


   }


}


class Demo {


    Public static void main( String[] args) {


     Sample s1= new Sample(23);


     Sample s2= new Sample(45);


    }


}

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Subject: Java

Q:

What is Constructor?

Answer

Constructor is not a special method.


Constructor is block of code that is executed automatically whenever object of the class is created.

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Subject: Java

Q:

When this. non-static datamember is compulsory inside non-static method

Answer

Whenever there is local- variable/parameter inside the method with same name as data member.


Ex:


Class Sample {


 int a;


  void show() {


   int a=5;


   system.out.println(a); // 5


   system.out.println(this.a);//23


  }


}


class MainApp {


  Public static void main(String[] args) {


  Sample s = new Sample();


   s.a = 23;


   s.show();


   }


}


 

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Subject: Java