【7.6】不定参数和ArrayList数组

1）：不定参数的使用

public class VariArgs {  

    public static void main(String[] args) {
        test("aaa");
        test("aaa", "bbb");
        test("aaa", "bbb", "ccc");
    }  

    public static void test(String arg, String... args) {
        System.out.println(arg);
        System.out.println("----------------");
        for (String s : args) {
            System.out.println(s);
        }
    }
}  

2）：ArrayList的定义和遍历

       //初始化
        Soldier infantry1=new Infantry("张三");
        Soldier infantry2=new Infantry("狗蛋");
        Soldier caverlyMan=new CaverlyMan("李四");
        Soldier artillery=new Artillery("王二");
        List<Soldier> soldiers=new ArrayList<Soldier>();

       //遍历
       //第一种
        for (Soldier soldier:soldiers){
           soldier.attack();
        }
        //第二种
        for (int i=0;i<soldiers.size();i++){
            //这里是soldiers.get(i) 而不是soldiers[i]
            soldiers.get(i).attack();
        }
         //第三种
        Iterator iterator=soldiers.iterator();
        while (iterator.hasNext()){
            iterator.next();
        }