java如何在循环中自动输出字符串

Question

所以我有个小问题

 int pickmeup = 0;
        while (true)
        {
        pickmeup = scanner.nextInt();
        if (pickmeup == 1)
         {System.out.println ("you entered 1");}
        if(pickmeup == 2)
         {System.out.println ("you entered 2");}
        {
            break;
        }
    System.out.println ("Invalid code");

现在，当我运行这段代码时，它在字符串方面运行得很好，但是当我输入“3”时，循环似乎运行得不太好，因为它不会返回字符串“Invalid code”

如果我去掉了两个If语句后面的字符串，那么它就工作得非常好。我到底做错了什么？是否有其他方法可以自动输出字符串

Answer 1

你可以先修改代码，你可以用eclipse源代码格式，也可以按CTRL+SHIFT+F

举个例子，据我所知，我已经纠正了很多，目前只有当达到else时，它才会中断。休息时间可以修改

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    int pickmeup = 0;
    while (true){
        pickmeup = scanner.nextInt();
        if (pickmeup == 1){
            System.out.println("one");
        }
        else if (pickmeup == 2){
            System.out.println("two");
        }
        else{
            System.out.println("Invalid code");
            break;
        }
    }

Answer 2

我相信你想用逻辑or和类似的

int pickmeup;
while (true) {
    pickmeup = scanner.nextInt();
    if (pickmeup == 1 || pickmeup == 2) {
        System.out.printf("you entered %d%n", pickmeup);
    } else {
        System.out.println("Invalid code");
    }
}

或者，您可以使用else if链

int pickmeup;
while (true) {
    pickmeup = scanner.nextInt();
    if (pickmeup == 1) {
        System.out.println("you entered 1");
    } else if (pickmeup == 2) {
        System.out.println("you entered 2");
    } else {
        System.out.println("Invalid code");
    }
}