Question

我正在为12年级的学校课程做一些基本的java工作，我很难在这段代码中找到我的错误。当num2大于num1时，输出正常，但当num1大于num2时，我得到3个输出而不是2个。我不确定我是否对括号做错了，但我刚刚开始学习java而且无法看到这个问题。

例如，如果num1是3，而num2是2，我得到2,3,2作为我的输出，但如果num1是2而num2是3，我得到2,3作为我的输出

import java.util.*;

public class HigherNumber
{
    public static void main (String[] args)
    {
        int num1 = 0;
        int num2 = 0;
        Scanner scannum1 = new Scanner (System.in);
        Scanner scannum2 = new Scanner (System.in);

        System.out.print("Enter your first number: ");
        num1 = scannum1.nextInt();
        scannum1.close();

        System.out.print("Enter your second number: ");
        num2 = scannum2.nextInt();
        scannum2.close();

        {
        if (num1 > num2) {
            System.out.println (num2);
            System.out.println (num1);
        }
        else
            System.out.println (num1);
            System.out.println (num2);
        }
    }
}

Answer 1

else      
 System.out.println (num1);
 System.out.println (num2);

需要一个开口支撑：

else {    
    System.out.println (num1);
    System.out.println (num2);
}

整体代码（因为你在任何地方都失去了大括号）应该是：

import java.util.*;

public class HigherNumber{
    public static void main (String[] args){
        int num1 = 0;
        int num2 = 0;
        Scanner scannum1 = new Scanner (System.in);
        Scanner scannum2 = new Scanner (System.in);
        System.out.print("Enter your first number: ");
        num1 = scannum1.nextInt();
        scannum1.close();
        System.out.print("Enter your second number: ");
        num2 = scannum2.nextInt();
        scannum2.close();
        if (num1 > num2) {
            System.out.println (num2);
        System.out.println (num1);
        }
        else{    
            System.out.println (num1);
            System.out.println (num2);
        }
    }
}

Answer 2

无需创建两个不同的扫描仪 - 您可以创建一个Scanner实例并在两个不同的时间调用nextInt（）。像这样：

Scanner scannum1 = new Scanner (System.in);
System.out.print("Enter your first number: ");
num1 = scannum1.nextInt();
System.out.print("Enter your second number: ");
num2 = scannum1.nextInt();
scannum1.close();

在Java中输出变量的问题

2 个答案: