Java- 在循环中使用 if 语句

Question

我写了一段小代码:

System.out.println("Please enter a number");
int number = scan.nextInt();

if(number == 1) {
    System.out.println("Number is 1");
} else if(number == 2) {
    System.out.println("Number is 2");
} else {
    System.out.println("Invalid selection");
}

当用户输入不同于 1 和 2 的数字时，用户会收到“无效选择”消息，然后代码终止。我不希望它终止，我希望它再次运行，直到用户写入 1 或 2。我尝试了 do-while 循环，但它变成了无限循环。你有什么建议？

Answer 1

你可以在这里使用while循环

 Scanner scanner = new Scanner(System.in);
 boolean status = true;
 while (status) { // this runs if status is true
    System.out.println("Please enter a number");
     int number = scanner.nextInt();
     if (number == 1) {
        System.out.println("Number is 1");
        status=false; // when your condition match stop the loop
     } else if (number == 2) {
        System.out.println("Number is 2");
        status=false;// when your condition match stop the loop
     } else{
        System.out.println("Invalid selection");
     }
 }