package com.bo.collection;
//Collection
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class Demo01  {
    public static void main(String[] args) {
        //建立一個集合
        Collection collection = new ArrayList();
        //新增元素
        collection.add("蘋果");
        collection.add("西瓜");
        collection.add("榴蓮");
        System.out.println("元素個數："+collection.size());
        System.out.println(collection);
        //刪除元素
        collection.remove("蘋果");
        System.out.println("刪除後元素個數："+collection.size());
        //清空元素
        //collection.clear();
        //System.out.println("清空元素後個數："+collection.size());

        //遍歷元素
        System.out.println("---------------增強for----------");
        for (Object object:collection) {
            System.out.println(object);
        }
        System.out.println("------------迭代器(專門用來遍歷集合)--------------");
        Iterator it=collection.iterator();
        while(it.hasNext()){
            String s =(String) it.next();
            System.out.println(s);
            //不能使用collection.remove()刪除方法
            //it.remove();//刪除用it.remove
        }
        System.out.println("刪除之後:"+collection.size());
        //判斷
        System.out.println(collection.contains("西瓜"));//有沒有西瓜
        System.out.println(collection.isEmpty());//是不是空的


    }
}