If语句求值

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。

你多大了? 21岁还没到法定年龄呢！构建成功(总时间:3秒)

我是java的新手，正在尝试自学，有人能帮我吗？

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

你的代码当前是这样的：“如果年龄大于18岁(即19岁或更高)，那么他们就不是年龄”。

我想你指的是x < 18

Answer 2

应该是另一种方式：

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

您创建了一个语句，该语句仅在x> 18时才会打印一行。您应该使用else if语句来结束该语句。

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!");
    }

}