我正在使用 blueJ 来写这个。我要做的是在 userGroup 类中编写一个名为 removeUser() 的方法,该方法将 String 作为参数,这是我要删除的用户名。使用迭代器,遍历列表,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东西!