class="java"> java的应该是有个类可以专门实现: package test; import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) { List list1=new ArrayList(); List list2=new ArrayList(); List list3=new ArrayList(); UserInfo user=new UserInfo("name1",12); UserInfo user1=new UserInfo("name2",12); UserInfo user2=new UserInfo("name3",12); UserInfo user3=new UserInfo("name4",12); list1.add(user); list1.add(user1); list1.add(user2); list1.add(user3); list2.add(user); list2.add(user); for (int i = 0; i < list2.size(); i++) { if(list1.containsAll(list2)){ list1.removeAll(list2); System.err.println(list1.size()); } } } } class UserInfo{ public UserInfo(){} public UserInfo(String name,int age){ this.userAge=age; this.userName=name; } public String userName; public int userAge; public int getUserAge() { return userAge; } public void setUserAge(int userAge) { this.userAge = userAge; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } } 上边的可以,利用了2个方法:if(list1.containsAll(list2)){list1.removeAll(list2);}先判断是否包含,如果包含那么移除。