Autoboxing and Autounboxing

Autoboxing is the process of converting the primitive type to Wrapper type(object) and unboxing is the vice versa .Below example illustrate the same.

package autobox;

public class AutoBoxExample {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  int i=10;
  Integer i1=new Integer(i);//boxing
  Integer i2=20;//boxing
  int i3=i2;//unboxing
  System.out.println(i1);
 }

}

output:
10 >>>Final
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Interfaces

Interface is used to attain 100% abstraction.
-- Interface contains only the definition and not the implementation.
-- interface by default attach variable (public static final) and for method it is (public and abstract)
-- interface can extends any number of interfaces and class can implement any number of interfaces.
-- The rule is it must override all the methods defined in the interface else it needs to be defined as abstract.

------

>>>Final
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