package com.bo.collection;

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

//ArrayList 陣列 查詢遍歷速度快 增刪慢
public class Demo05 {
    public static void main(String[] args) {
        //建立集合
        ArrayList arrayList=new ArrayList();
        //新增元素
        Student s1 = new Student("趙",20);
        Student s2 = new Student("錢",21);
        Student s3 = new Student("孫",22);
        arrayList.add(s1);
        arrayList.add(s2);
        arrayList.add(s3);
        System.out.println("元素個數："+arrayList.size());
        System.out.println(arrayList.toString());
        //刪除元素
        arrayList.remove( new Student("趙",20));//重寫返回後可以刪除
        System.out.println("刪除之後："+arrayList.size());
        //遍歷元素
        System.out.println("------迭代器-------");
        Iterator it= arrayList.iterator();
        while(it.hasNext()){
            Student s=(Student)it.next();
            System.out.println(s);
        }
        System.out.println("------列表迭代器-------");
        ListIterator lit = arrayList.listIterator();
        while(lit.hasNext()){
            Student s=(Student)lit.next();
            System.out.println(s);
        }
        while(lit.hasPrevious()){
            System.out.println(lit.previous()+":"+lit.previousIndex());

        }
        //判斷
        System.out.println(arrayList.contains(new Student("錢",21)));
        System.out.println(arrayList.isEmpty());
        //查詢
        System.out.println(arrayList.indexOf(s2));
    }
}