Question

现在我有一个运行银行应用程序的单一程序。

我来自JS背景，是Java的新手。

我基本上创建了一个：

User username = new User(Double startingMoney, 
String fName, String lName, String userName, String passWord);

然后你会做以下事情：

username.setBalance(Double balanceAmt); or username.getBalance();

问题是，我不确定如何命名对象。我希望我的程序允许用户注册一个新的用户帐户，并使用他们拥有的任何用户名，作为对象的名称。

在JS中，您可以使用String作为对象变量名。

我甚至不确定这是否是创建新用户的正确方法。我不确定以后如何引用特定对象，为用户设置余额。

IE：我有两个用户......因此有两个用户对象......一个约翰和一个贝蒂。

如果当前登录了betty，我不确定我是如何调用betty.setBalance（20.00）;

有任何建议或指示吗？感谢。

Answer 1

应该制作一个类用户。可以制作通常的制定者和吸气剂。但要实例化你所要求的，你可以在实例化对象时给出参数中的参数。我已经为该类添加了2个构造函数作为示例。

     public class User
{
    private double startingMoney;
    private String firstName;
    private String lastName;
    private String username;
    private String password;

    private static int count = 0; // number of objects in memory

    // initialize user, add 1 to static count and
     // output String indicating that constructor was called
     public User( String first, String last )
     {
        firstName = first;
        lastName = last;

        count++; // increment static count of Users
        System.out.printf( "User constructor: %s %s; count = %d\n",
           firstName, lastName, count );
     } // end User constructor


     private double startingMoney;
    private String firstName;
    private String lastName;
    private String username;
    private String password;


     //another constructer 
     public User( Double sMoney, String first, String last, String name, String pass)
     {
        startingMoney = sMoney
        firstName = first;
        lastName = last;
        username = name;
        password = pass;

        count++; // increment static count of Users
        System.out.printf( "User constructor: %s %s; count = %d\n",
           firstName, lastName, count );
     } // end User constructor


     // subtract 1 from static count when garbage
     // collector calls finalize to clean up object;
     // confirm that finalize was called
     protected void finalize()
     {
        count--; // decrement static count of users
        System.out.printf( "User finalizer: %s %s; count = %d\n",
           firstName, lastName, count );
     } // end method finalize

   // set first name
     public String setFirstName(String firstName)
     {
        this.firstName = firstName;
     } // end method setFirstName

     // set last name
     public String setLastName(String lastName)
     {
        this.lastName = lastName;
     } // end method setLastName

    // set user name
     public String setUserName(String name)
     {
        this.username = name;
     } // end method setUserName

     // set password
     public String setPassword(String password)
     {
        this.password = password;
     } // end method setPassword






     public String getStartingName()
     {
        return startingName;
     } // end method getstartingName


    // get username
     public String getUserName()
     {
        return username;
     } // end method getUserName

     // get password
     public String getPassword()
     {
        return password;
     } // end method getPassword

    // get first name
     public String getFirstName()
     {
        return firstName;
     } // end method getFirstName

     // get last name
     public String getLastName()
     {
        return lastName;
     } // end method getLastName

     // static method to get static count value
     public static int getCount()              
     {                                         
        return count;                          
     } // end method getCount

}

Answer 2

首先创建一个类，然后为该类创建两个对象。

class User {

//Constructor
User(Double startingMoney, String fName, String lName, String userName, String passWord) {
this.startingMoney=startingMoney;
this.fName=fName;
this.lName=lName; 
this.userName=userName;
this.passWord=passWord;
}
double startingMoney;
String fName;
String lName; 
String userName;
String passWord;
}


User john = new User(..Values.); //pass arguments related to john
User betty= new User(..Values.); //pass arguments related to betty

john.getLName();  
betty.setPassword("pass");


in java you cant create a runtime variable; better do this way
whenever user is arrived; use a Map
Map.add("userName", new User(...Values..)); //userName as key
then get that object like Map.get("userName")

Answer 3

这样做的一种方法是使用Map。在哪里使用名称作为键，值将是User对象。

Map <String, User> users = new Hashmap<String, User>();
users.put("betty", new User(...));
users.get("betty").setBalance(20.00);

在Java中创建用户配置文件的最佳方式

3 个答案: