新的 Java 开发人员 - Simple Q

Question

我最近才开始编码，并且是初学者。我正在尝试制作一个程序，该程序仅要求用户输入“密码”，并取决于密码是否正确；增加一个计数器。并且，一旦计数器达到 10，打印出一条消息。 基本上我想做的就像一张“剪贴卡”，就像你可以在咖啡店买到的那种（每 10 杯咖啡免费）。

所以，这就是我现在所拥有的。我只需要知道如何在输入密码后让程序继续运行，并跟踪输入。

哦，还有...如果不清楚，请说出来，我会尽力澄清。

这是我必须要做的……

import java.util.Scanner;

public class Coffee {

public static void main(String [] args){


    int count = 0;
    String pass = "hey";

    System.out.println("Enter password: ");

    Scanner key = new Scanner(System.in);

    String moves = key.nextLine();

    if(moves.compareTo(pass) == 0){

        count++;
        System.out.println("You're one step closer to a free coffe! You have so far bought " + count + " coffe(s)");
    }
    if(count % 10 == 0 && count != 0){
        System.out.println("You've got a free coffe!");
    }
    if(moves.compareTo(pass) != 0){
    System.out.println("Wrong password! Try again.\n");
    }
}
}

Answer 1

您的计划什么时候结束？按照你的描述，它可以永远持续下去。

如果是这样，您只需将其包含在 while 循环中：

public static void main(String [] args) {
    Scanner key;
    String moves;
    int count = 0;
    String pass = "hey";
    while(true) {
        System.out.println("Enter password: ");
        key = new Scanner(System.in);
        moves = key.nextLine();
        if(moves.compareTo(pass) == 0){
            count++;
            System.out.println("You're one step closer to a free coffe! You have so far bought " + count + " coffe(s)");
        }
        if(count % 10 == 0 && count != 0){
            System.out.println("You've got a free coffe!");
        }
        if(moves.compareTo(pass) != 0){
            System.out.println("Wrong password! Try again.\n");
        }
    }
}

但你真的应该有一个打破条件。

Answer 2

你需要循环（while、do-while 或 for 循环）来做这种重复的事情。

示例代码可能会有所帮助

导入 java.util.Scanner;

公开课咖啡{

public static void main(String[] args) {

    int count = 0;
    String pass = "hey";

    System.out.println("Enter password: ");

    Scanner key = new Scanner(System.in);

    String moves = key.nextLine();
    boolean flag = true;
    while (flag) {

        if (moves.compareTo(pass) == 0) {

            count++;
            System.out
                    .println("You're one step closer to a free coffe! You have so far bought "
                            + count + " coffe(s)");
        }
        if (count == 10 && count != 0) {
            System.out.println("You've got a free coffe!");
            count=0;
        }
        if (moves.compareTo(pass) != 0) {
            System.out.println("Wrong password! Try again.\n");
        }
        System.out.println("Do you want to continue ..(y/n)");
        String choice = key.nextLine();
        if (choice.equals("n")) {
            flag = false;
        } else {
            flag = true;
        }
    }
}

}

Answer 3

我会给你一个 while 和 do-while 循环供你选择

While循环

Scanner key;
String moves;
int count = 0;
String pass = "hey";
boolean condition=true;
while(condition) {
    System.out.println("Enter password: ");
    key = new Scanner(System.in);
    moves = key.nextLine();
    if(moves.compareTo(pass) == 0){
        count++;
        System.out.println("You're one step closer to a free coffe! You have so far bought " + count + " coffe(s)");

        if(count % 10 == 0 && count != 0){
        System.out.println("You've got a free coffe!");
        condition=false;
        }
    }
    else if(moves.compareTo(pass) != 0){
        System.out.println("Wrong password! Try again.\n");
    }
}

Do-While 循环

Scanner key;
String moves;
int count = 0;
String pass = "hey";
boolean condition=true;
do{
    System.out.println("Enter password: ");
    key = new Scanner(System.in);
    moves = key.nextLine();
    if(moves.compareTo(pass) == 0){
        count++;
        System.out.println("You're one step closer to a free coffe! You have so far bought " + count + " coffe(s)");

        if(count % 10 == 0 && count != 0){
        System.out.println("You've got a free coffe!");
        condition=false;
        }
    }
    else if(moves.compareTo(pass) != 0){
        System.out.println("Wrong password! Try again.\n");
    }
}while(condition);