Java 示例 - 方法重载

• 

  问题描述

  如何重载方法？
• 

  解决方案

  此示例显示了根据参数的类型和数量重载方法的方式。

  
  class MyClass {
     int height;
     MyClass() {
        System.out.println("bricks");
        height = 0;
     }
     MyClass(int i) {
        System.out.println("Building new House that is " + i + " feet tall");
        height = i;
     }
     void info() {
        System.out.println("House is " + height + " feet tall");
     }
     void info(String s) {
        System.out.println(s + ": House is " + height + " feet tall");
     }
  }
  public class MainClass {
     public static void main(String[] args) {
        MyClass t = new MyClass(0);
        t.info();
        t.info("overloaded method");
        
        //Overloaded constructor:
        new MyClass();
     }
  }
  

• 

  结果

  上面的代码示例将产生以下结果。

  
  Building new House that is 0 feet tall.
  House is 0 feet tall.
  Overloaded method: House  is 0 feet tall.
  bricks
  

  以下是方法重载的另一个示例

  
  public class Calculation {
     void sum(int a,int b){System.out.println(a+b);}
     void sum(int a,int b,int c){System.out.println(a+b+c);}
     public static void main(String args[]){
        Calculation cal = new Calculation();
        cal.sum(20,30,60);
        cal.sum(20,20);
     }
  }
  

  上面的代码示例将产生以下结果。

  
  110
  40