1 import java.util.ArrayList; 2 import java.util.Iterator; 3 4 import cn.itcast.p1.bean.Person; 5 6 public class ArrayListTest2 { 7 8 public static void main(String[] args) { 9 10 11 ArrayList al = new ArrayList();12 13 al.add(new Person("lisi1",21));14 al.add(new Person("lisi2",22)); //与28行的Person,内容相同,地址不同15 al.add(new Person("lisi3",23));16 al.add(new Person("lisi4",24));17 al.add(new Person("lisi2",22));18 al.add(new Person("lisi3",23));19 20 System.out.println(al);21 22 al = getSingleElement(al);23 24 System.out.println(al);25 26 System.out.println(al.remove(new Person("lisi2",22)));//remove内部是用equals来判断删除内容27 System.out.println(al);28 29 }30 31 32 33 private static ArrayList getSingleElement(ArrayList al) {34 //1.定义一个临时容器35 ArrayList temp = new ArrayList();36 37 //2.迭代al集合38 Iterator it = al.iterator();39 40 while (it.hasNext())41 {42 Object obj = it.next();43 44 //3.判断被迭代到的元素是否在临时容器中存在45 if (!temp.contains(obj))46 {47 temp.add(obj);48 }49 }50 51 return temp;52 }53 54 }
原标题:【Java学习笔记】集合框架定义功能去除ArrayList中的重复元素
关键词:JAVA