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;

     }

 }