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PRAMOD KUMAR
GARBAGE COLLECTOR
2 Answer(s)      a year and 2 months ago
Posted in : Java Beginners


What is garbage collector in java?


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July 8, 2013 at 11:23 PM


In order to achieve run-time polymorphism in java following supports needed. At first overrides the super-class one or more methods in subclass this is due to the fact that ‚??an overrides concept in java led the foundation to achieve run-time polymorphism at later time with the help of dynamic method dispatch mechanism as follows:

About Dynamic method dispatch‚??Further dynamic method dispatch mechanism allowed that the super-class object reference variable can points to subclass overridden method only this is rendered possible that a call to overridden method is decided dynamically based on the version/type of object it points/refers and finally help to achieved run-time polymorphism.

//Example : java application to implement run-time polymorphism.

//Defining super-class Base

class Base{

protected void disp(){

System.out.println("Super-class Base disp() method called");

}//close of disp()

}//close of class Base

class Derived1 extends Base{

public void disp(){

System.out.println("Subclass Derived1 disp() method called");

}//close of disp()

}//close of class Derived1

class Derived2 extends Base{

public void disp(){

System.out.println("Subclass Derived2 disp() method called");

}//close of disp()

}//close of class Derived2

class Polymorphism{

public static void main(){

Derived1 d1=new Derived1();

Derived1 d2=new Derived2();

Base B;

B=d1;

B.disp(); //disp() is polymorphic method to achieve run-time polymorphism

B=d2;

B.disp();

}//close of main()

}//close of class Polymorphism



July 24, 2013 at 2:42 PM


BASICALLY GARBAGE COLLECTOR IS AN AUTOMATIC PROCESS RUN BY JDK COMPILER IN ORDER TO CLEAN THE UNUSED OBJECTS...UNUSED OBJECTS MEANS WHENEVER THERE IS NO REFERENCE POINTING TO OBJECT ..THAT OBJECT IS COLLECTED BY GARBAGE COLLECTOR IN ORDER TO FREE UP THE SPACE OCCUPIED BY OBJECTS IN MEMORY..



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