package com.bo.collection;

import java.util.ArrayList;
import java.util.Iterator;

public class Demo08 {
    public static void main(String[] args) {
        ArrayList<String> arrayList=new ArrayList();//如果不使用泛型 Integer型別轉String回報錯
        arrayList.add("張三");              //使用泛型 別的型別資料就新增不進去 不用擔心轉換出錯
        arrayList.add("李四");
        //arrayList.add(100);
        //arrayList.add(200);
        for (String string:arrayList) {
            System.out.println(string);
        }
        ArrayList<Student> arrayList1 =new ArrayList();
        Student s1 = new Student("趙",20);
        Student s2 = new Student("錢",21);
        Student s3 = new Student("孫",22);
        arrayList1.add(s1);
        arrayList1.add(s2);
        arrayList1.add(s3);
        Iterator<Student> it =arrayList1.iterator();//不寫泛型就是Object型別
        while(it.hasNext()){
            Student s = it.next();
            System.out.println(s.toString());
        }
    }
}