Classes and Objects textbook series (three) - What is Java method overloading

Overloaded method refers to the same method name, but not the same type of argument

Step 1: A method of overload attack
Step 2: variable number of arguments
Step 3: Practice - Treatment
Step 4: The answer - Treatment

Step 1: Method Overload attack

There is a hero, called a physical attack hero ADHero
provides three ways to ADHero

public  void  attack() public  void  attack(Hero h1) public  void  attack(Hero h1, Hero h2)

Method name is the same, but not the same type of parameters
when calling the method of attack, based on the type and number of parameters passed automatically call the corresponding method

public  class  ADHero  extends  Hero {      public  void  attack() {          System.out.println(name +  " 进行了一次攻击 ，但是不确定打中谁了" );      }        public  void  attack(Hero h1) {          System.out.println(name +  "对"  + h1.name +  "进行了一次攻击 " );      }        public  void  attack(Hero h1, Hero h2) {          System.out.println(name +  "同时对"  + h1.name +  "和"  + h2.name +  "进行了攻击 " );      }        public  static  void  main(String[] args) {          ADHero bh =  new  ADHero();          bh.name =  "赏金猎人" ;            Hero h1 =  new  Hero();          h1.name =  "盖伦" ;          Hero h2 =  new  Hero();          h2.name =  "提莫" ;            bh.attack(h1);          bh.attack(h1, h2);      }   }

Step 2: variable number of arguments

If you want to attack more heroes, we need to design more methods, this class will become very cumbersome, like this:

public  void  attack(Hero h1) public  void  attack(Hero h1,Hero h2) public  void  attack(Hero h1,Hero h2,Hero h3)

At this time, a variable number of parameters can be used
only to design a method
public void attack (Hero ... heros)
a method as described above can represent all
the methods, the use of an array mode process operation parameters can heros

public  class  ADHero  extends  Hero {        public  void  attack() {          System.out.println(name +  " 进行了一次攻击 ，但是不确定打中谁了" );      }        // 可变数量的参数      public  void  attack(Hero... heros) {          for  ( int  i =  0 ; i < heros.length; i++) {              System.out.println(name +  " 攻击了 "  + heros[i].name);            }      }        public  static  void  main(String[] args) {          ADHero bh =  new  ADHero();          bh.name =  "赏金猎人" ;            Hero h1 =  new  Hero();          h1.name =  "盖伦" ;          Hero h2 =  new  Hero();          h2.name =  "提莫" ;            bh.attack(h1);          bh.attack(h1, h2);        }   }

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