java - If 语句评估

Question

使用下面的代码，即使我输入了一个大于 18 的数字，我也会得到这个结果。
运行：你多大了？21 你还没成年呢！构建成功（总时间：3 秒）

我是java新手，正在尝试自学，有人可以帮忙吗？

import java.util.Scanner;
public class Chapter8 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner reader = new Scanner (System.in);
        // TODO code application logic here

        //Excercise 15
        System.out.print("How old are you? ");
        int x = Integer.parseInt(reader.nextLine());
        if (x > 18){
            System.out.println("You have not reached the age of Majority yet!");
        }else {
            System.out.println("You have reached the age of Majority!");
        }

Answer 1

您的代码当前显示为“如果年龄大于 18 岁（即 19 岁或以上），则他们未达到年龄”。

我想你的意思是x < 18

Answer 2

应该反过来：

if (x < 18){
       System.out.println("You have not reached the age of Majority yet!");
}else {
        System.out.println("You have reached the age of Majority!");
}

Answer 3

你做了一个只有在 x > 18 时才会打印一行的语句。你应该做一个 else if 语句来完成这个语句。

public static void main(String[] args) {
    Scanner reader = new Scanner (System.in);
    // TODO code application logic here

    //Excercise 15
    System.out.print("How old are you? ");
    int x = Integer.parseInt(reader.nextLine());
    if (x > 18){
        System.out.println("You have not reached the age of Majority yet!");
    }
    else if (x <= 17){
        System.out.println("You have reached the age of Majority!");
    }

}