终止后如何重新启动Java方法

debugcn 发表于 Dev

香奈儿90

我是 Java 新手，我想我会制作经典的用户名和密码验证程序之一，我已经成功地制作了没有明显错误的程序，但是如果用户输入了不正确的信息，我希望程序基本上重新启动输入. 每次用户输入错误信息时，我将如何成功重新启动程序？

代码如下：

import java.util.Scanner;
public class UserPass {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        String user; //Creating user-name variable.
        String pass; //Creating password variable.


        System.out.println("Enter username here: "); //Message to tell user to input the user-name.
        user = input.nextLine(); //Taking the users user-name input.

        System.out.println("Enter the password here: "); //Message to tell user to input the password.
        pass = input.nextLine(); //Taking the users password input.

        //Validating the users User-name and password input.
        if(user.equals("Shane") && (pass.equals("Temple"))) {
            System.out.println("Correct!"); //If the User-name and password are both correct then a message will tell the user that they are correct.
        }

        else {
            System.out.println("The Usernname or Password that you have entered was in-correct"); //If above conditions are not met then message will tell the user that they have entered the wrong user-name or password
        }
    }

}

我知道这是非常基本的，因为我说我对 Java 很陌生（2 小时前是新的）。

我想在 else 条件语句中调用“main”方法，但是我听说比程序第一次启动时使用“main”方法的次数更多是基本做法。

提前致谢：）

桑托什

我希望这就是你想要的。

import java.util.Scanner;

public class UserPass {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String user; //Creating user-name variable.
        String pass; //Creating password variable.
        boolean isValidUser = false;

        while(!isValidUser) {
            System.out.println("Enter username here: "); //Message to tell user to input the user-name.
            user = input.nextLine(); //Taking the users user-name input.

            System.out.println("Enter the password here: "); //Message to tell user to input the password.
            pass = input.nextLine(); //Taking the users password input.

            //Validating the users User-name and password input.
            if(user.equals("Shane") && (pass.equals("Temple"))) {
                System.out.println("Correct!"); 
                isValidUser = true;
            }
            else {
                System.out.println("The Usernname or Password that you have entered was in-correct"); 
                isValidUser = false;
            }
        }
    }
}

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