java - Java 中的错误处理 InputMismatchException

Question

我正在创建电梯模拟，但在错误处理方面遇到问题。当用户输入字母而不是整数时，它会抛出 InputMismatchException。我该如何解决？下面是代码:

System.out.println("Please define... ");
        System.out.println("Number of floors:");
        Building building = new Building(in.nextInt()); 
        System.out.println("Number of lifts:");
        building.setNoOfLifts(in.nextInt());
        building.setLifts();
        System.out.println("Maximum number of people to enter building at one time:");
        building.setMaxPeople(in.nextInt());
        System.out.println("Maximum capacity of the lifts:");
        int maxLiftCapacity = in.nextInt();
        System.out.println("Simulation will now begin.");
        Queue queue = new Queue();

Answer 1

这里有一些代码可能会有所帮助。读取整数并在循环中捕获异常。当输入是整数时，循环退出。当抛出异常时，循环继续。

  Scanner sc = new Scanner(System.in);
  int i=0;
  while(true) {
      System.out.println("enter an integer:");
      try {
          int i = sc.nextInt();          
          break;
     } catch(InputMismatchException ignore){}
 }

 // i has been read successfully