避免在ArrayList中覆盖对象

Question

堆垛机.我一直在网站上搜索我的问题,但没找到我要找的东西.我坚持使用这段代码:

public class Users{
ArrayList<ValidateUser> personer = new ArrayList<ValidateUser>();
ValidateUser newUser = new ValidateUser();
    newUser.setUser("administrator");
    newUser.setPass("asdf123");
    newUser.setBalance(0.8);
    newUser.setType("admin");
    personer.add(newUser);

有一个很好的数组列表,但如果我向ArrayList添加更多"newUsers",它们似乎互相覆盖.我不想创建一个newUser1,newUser2对象,因为稍后在我的程序中,我必须能够直接从程序中添加新用户.

怎么做到这一点？

的ValidateUser:

public class ValidateUser {

private String username;
private String password;
private double balance;
private String role;


public void setUser(String user) {
    username = user;
}
public void setPass(String pass) {
    password = pass;
}
public void setBalance(double rating) {
    balance = rating;
}
public void setType(String type) {
    role = type;
}

public String getUsername() {
    return username;
}
public String getPassword() {
    return password;
}
public double getBalance() {
    return balance;
}
public String getRole() {
    return role;
}

}

Answer 1

如果我理解你正在以这种方式添加新用户:

ValidateUser newUser = new ValidateUser();
    newUser.setUser("administrator");
    newUser.setPass("asdf123");
    newUser.setBalance(0.8);
    newUser.setType("admin");
    personer.add(newUser);

    newUser.setUser("different admin");
    personer.add(newUser);

但是这样对象指向相同的引用,因此您必须执行以下操作来实例化新对象:

 newUser = new ValidateUser();
 newUser.setUser("foo");
 personer.add(newUser);