December 13, 2013

Method Overriding example in java


This is a small example for overriding in java.


Method Overriding : Implementation in sub class with same parameters and type signature Overrides the implementation in super class. Call of overriding is resolved through dynamic binding by JVM. JVM only deals with overriding.


Base class


public class Base {
   
    public void area()
    {
        System.out.println(" area inside base class ");
    }

}



Derived class


public class Derived  extends Base{
   
    public void area() {
        //super.area();
        System.out.println(" area inside derived class");
    }

}


Main class


public class Main {
  
    public static void main(String[] args) {
        System.out.println(" inside main ");
      
        System.out.println("----------------------------------");
        System.out.println("1. Base b = new Base() ");
        Base b = new Base();
        b.area();
      
        System.out.println("----------------------------------");
        System.out.println("2. Derived d = new Derived() ");
        Derived d = new Derived();
        d.area();
     
        System.out.println("----------------------------------");
        System.out.println("3. Base bd = new Derived()");
        Base bd = new Derived();
        bd.area();
      
        System.out.println("----------------------------------");
      
    }

}


+vipin


Real world example for the method overriding in java


Description


Source code



public class Employees{

int getSalary(){

return 1000;
}

}

class Clerk extends Employee{
int getSalary(){return 20000;}
}


class HumanResourceManager extends Employee{
int getSalary(){return 50000;}
}

class TeamLeader extends Employee{
int getSalary(){return 75000;}
}

class Developer extends Employee{
int getSalary(){return 95000;}
}


class CheckSalary{

public static void main(String args[]){
Employee e= new Clerk();
System.out.println(" salary : "+e.getSalary());
Employee e= new HumanResourceManager();
System.out.println(" salary : "+e.getSalary());
Employee e= new Developer();
System.out.println(" salary : "+e.getSalary());

}

}

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