【Java学习笔记】<集合框架>定义功能去除ArrayList中的重复元素

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

import cn.itcast.p1.bean.Person;

public class ArrayListTest2 {

    public static void main(String[] args) {

        
        ArrayList al = new ArrayList();
        
        al.add(new Person("lisi1",21));
        al.add(new Person("lisi2",22));  //与28行的Person，内容相同，地址不同
        al.add(new Person("lisi3",23));
        al.add(new Person("lisi4",24));
        al.add(new Person("lisi2",22));
        al.add(new Person("lisi3",23));
        
        System.out.println(al);
        
        al = getSingleElement(al);
        
        System.out.println(al);
        
        System.out.println(al.remove(new Person("lisi2",22)));//remove内部是用equals来判断删除内容
        System.out.println(al);

    }

    

    private static ArrayList getSingleElement(ArrayList al) {
        //1.定义一个临时容器
        ArrayList temp = new ArrayList();
        
        //2.迭代al集合
        Iterator it = al.iterator();
        
        while (it.hasNext())
        {
            Object obj = it.next();
            
            //3.判断被迭代到的元素是否在临时容器中存在
            if (!temp.contains(obj))
            {
                temp.add(obj);
            }
        }
        
        return temp;
    }

}