java - 通过用户名从数组列表中删除用户

Question

我正在使用 blueJ 来编写此内容。我想做的是在 userGroup 类中编写一个名为removeUser() 的方法，该方法接受一个 String 作为参数，这是我想要删除的用户名。使用迭代器迭代列表，直到找到具有该用户名的用户并将其删除。我的代码是:

package user; 
public class User{
    public enum UserType{                          
        ADMIN, EDITOR, USER;
    }

    private String id;                            
    private UserType userPermissions;              
    private String actualName;                     

    public User(String username, UserType userType, String name){
        id = username;
        userPermissions = userType;
        actualName= name;
    }

    public String getUsername(){
        return id;
    }

    public UserType getUserType(){
        return userPermissions;
    }       

    public String getName(){
        return actualName;
    }

    public void setUserType(UserType input){
        userPermissions = input;
    }
}

userGroup 类是:

package user;
import java.util.*;
import user.User.UserType; 

public class UserGroup{

    private ArrayList<User> people;

    public UserGroup(){
        people = new ArrayList<User>();
    }

    public void addSampleData(){
        people.add(new User("jar1g13", UserType.ADMIN,"Jonny"));
        people.add(new User("ao9", UserType.EDITOR,"Aniruddh"));
        people.add(new User("pe6", UserType.USER,"Peter"));
        people.add(new User("mat73", UserType.USER,"Matthew"));
        people.add(new User("ora69", UserType.EDITOR,"Oranthi"));
        people.add(new User("ben12", UserType.USER,"Benedict"));
        people.add(new User("cam30", UserType.ADMIN,"Cambyse"));
        people.add(new User("are20", UserType.USER,"Alex"));
        people.add(new User("lim19", UserType.USER,"Liam"));
        people.add(new User("ada13", UserType.EDITOR,"Adam"));
    } 

    public User getUser(int idx){
        return people.get(idx);
    }

    public void printUsernames(){
        for (User user: people){
            System.out.printf("%s %s\n", user.getUsername(), user.getUserType());
        }
    }

    public void removeFirstUser(){
        people.remove(0);
    }

    public void removeLastUser(){
        people.remove(people.size()-1);
    }

    public void removeUser(String username){
        people.remove(username);
    }

}

这一切都编译得很好，但是当我运行removeUser方法时，它似乎没有从数组中删除任何内容!

Answer 1

public void removeUser(String username) {
     Iterator<User> itr = people.iterator();
     while (itr.hasNext()) {
          Users element = (User) itr.next();
          if (element.getUsername().equals(username)) {
               itr.remove(); // REMOVE THIS FROM Iterator
          }
     }
}