Question

我试图要求用户继续键入数字，直到他们输入-1后，代码会说谢谢你以后再见！我现在被卡住了，因为我的循环是无限循环而我试图在不使用迭代的情况下解决它。这就是我所拥有的。

Scanner reader = new Scanner(System.in);
System.out.println("Type numbers: ");
int num = Integer.parseInt(reader.nextLine());   
while (num < -1 || num > -1) {
    System.out.println(num);   
        if (num == -1) {
        System.out.println("Thank you and see you later!");
        break;
    }

}

Answer 1

您需要读取循环内的输入。你只做了一次（在进入循环之前）所以num的值永远不会改变。此外，您可以使用while (num != -1)

简化您的状态

所以最终，你想要这样的东西：

Scanner reader = new Scanner(System.in);
System.out.println("Type numbers: ");
int num = 0;
while (num != -1) {
    num = Integer.parseInt(reader.nextLine());   

        if (num == -1) {
            System.out.println("Thank you and see you later!");

    }else{
       System.out.println(num);   
    }

}

Answer 2

试试这段代码：

Scanner reader = new Scanner(System.in);
int num = 0;
System.out.println("Type numbers: ");
while(true){
    //get user input
    num = Integer.parseInt(reader.nextLine());
    if(num == -1){
        System.out.println("Thank you and see you later!");
        break;
    }
}

阅读数字直到满足条件

2 个答案: