如何启用断言? [英] How to enable assertions?

问题描述

在我的在线Java编程课程中，我必须编写一个程序，让用户输入年龄，并检查该年龄是否在0到125之间-如果不是，则显示错误代码，我需要使用断言来去做.这是我的代码:

In my online Java programming class I have to write a program where the user enters their age, and checks if it's between 0 and 125 - if it isn't, it shows an error code, and I need to use assertions to do that. Here is my code:

import java.util.Scanner;

public class eproject1 {

   public static void main(String args[]) {

      Scanner input = new Scanner(System.in);

      System.out.print("What is your age? ");

      int num = input.nextInt();

      System.out.println(num);

      assert(num >= 1 && num < 125);

      System.out.printf("You entered %d\n", num); // NEED TO FIX, SOMETHING ISN'T RIGHT

   }

}

问题是，它告诉您输入的年龄，即使它不在1到124的范围内.研究表明我需要实际启用断言，但是我在网上发现的结果非常无助，因为它们涉及某些Eclipse.东西-我确定这是菜鸟犯的错误，因为我不太擅长编程.

The problem is that it tells you what age you entered, even if it's out of the range 1 to 124. Research says that I need to actually enable assertions, but the results I found online were very unhelpful as they involved some Eclipse stuff - I'm sure it's some kind of rookie mistake, since i'm not very good at programming.

那么...您如何使断言起作用?

So ... how do you get the assertion stuff to work?

推荐答案

java -ea< program_name> 应该在命令提示符下执行.

java -ea <program_name> should do it on the command prompt.

对于 intellJ，您可以尝试以下操作和 eclipse .

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