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28: Function Overloading-- Java Programming in Urdu

Function Overloading

Method Overloading is a feature that allows a class to have more than one method having the same name, if their argument lists are different. It is similar to constructor overloading in Java, that allows a class to have more than one constructor having different argument lists

Example 1:

This example shows how method overloading is done by having different number of parameters
class DisplayOverloading
{
    public void disp(char c)
    {
         System.out.println(c);
    }
    public void disp(char c, int num)  
    {
         System.out.println(c + " "+num);
    }
}
class Sample
{
   public static void main(String args[])
   {
       DisplayOverloading obj = new DisplayOverloading();
       obj.disp('a');
       obj.disp('a',10);
   }
}



Example 2:

In this we try to rxplain Difference in data type of parameters
class DisplayOverloading
{
    public void disp(char c)
    {
         System.out.println(c);
    }
    public void disp(char c, int num)  
    {
         System.out.println(c + " "+num);
    }
}
class Sample
{
   public static void main(String args[])
   {
       DisplayOverloading obj = new DisplayOverloading();
       obj.disp('a');
       obj.disp('a',10);
   }
}

Example 3: Overloading with Type Promotion if matching found
class OverloadingCalculation2{  
  void sum(int a,int b){System.out.println("int arg method invoked");}  
  void sum(long a,long b){System.out.println("long arg method invoked");}  
  
  public static void main(String args[]){  
  OverloadingCalculation2 obj=new OverloadingCalculation2();  
  obj.sum(20,20);//now int arg sum() method gets invoked  
  }  
}