Java method overloading (Overload)

Understanding of overloading (Overload) of

• Why use method overloading:

  • For a similar function method, the parameter list is not the same as the method if you define a different name, too cumbersome and difficult to remember.
  • To solve this problem, the introduction of overloaded methods.

• Overloaded definitions:

  • Multiple methods of the same name, but different argument list.

• Do not use method overloading

  • Similar method defines three functions
    

    public class TestOverload {
        public static int sumOne(int a) {
            return a;
        }
        public static int sumTwo(int a, int b) {
            return a + b;
        }
        public static int sumThree(int a, int b, int c) {
            return a + b + c;
        }
    }

    View Code

     

  • Use these three methods
    

    public static void main(String[] args) {
        System.out.println (sumone ( . 1 ));
         // output. 1 
        
        System.out.println (sumTwo ( . 1, 2 ));
         // output. 3 
    
        System.out.println (sumThree ( . 1, 2,. 3 ));
         // output 6 
    }

    View Code

     

• Use heavy-duty

  • Similar method defines three functions
    

    public class TestOverload {
        public static int sum(int a) {
            return a;
        }
        public static int sum(int a, int b) {
            return a + b;
        }
        public static int sum(int a, int b, int c) {
            return a + b + c;
        }
    }

    View Code

     

  • Use these three methods
    

    public static void main(String[] args) {
        System.out.println (SUM ( . 1 ));
         // output. 1 
        
        System.out.println (SUM ( . 1, 2 ));
         // output. 3 
    
        System.out.println (SUM ( . 1, 2,. 3 ));
         // output 6 
    }

    View Code

     

• to sum up:

  • Contrast can be seen if a similar function method, you can use method overloading, so not only easy to remember, it is also convenient to call.