Question

我让用户输入他们的位置。并根据他们的位置有薪酬差异。 if语句不会改变变量“pay” 有人能帮助我吗？

import java.util.HashMap;
import javax.swing.*;

public class TimeSheet {

    public static void main(String[] args) {

        String loc;
        String[] startday = new String[7];
        String[] endday = new String[7];
        int x = 0;
        int y = 0;
        int num = 1;
        int location;
        double starttime;
        double endtime;
        double hour = 0;
        double total = 0;
        double pay = 0;
        double totalpay;

        loc = JOptionPane.showInputDialog(null, "Enter your Work Location");
        location = Integer.parseInt(loc);

        if (location == 100 && location < 200 ) {
            pay = 10.00;
        }
        else if (location == 200 && location < 300) {
            pay = 7.50;
        }
        else if (location == 300 && location < 400) {
            pay = 9.25;
        }
        else if (location == 400 && location < 500) {
            pay = 13.50;
        }
        else if (location == 500 && location < 600) {
            pay = 8.00;
        }

        HashMap<String, Double> map = new HashMap<String, Double>();
        map.put("1",9.0);
        map.put("2",9.5);
        map.put("3",10.0);
        map.put("4",10.5);
        map.put("5",11.0);
        map.put("6",11.5);
        map.put("7",12.0);
        map.put("8",12.5);
        map.put("A",13.0);
        map.put("B",13.5);
        map.put("C",14.0);
        map.put("D",14.5);
        map.put("E",15.0);
        map.put("F",15.5);
        map.put("G",16.0);
        map.put("H",16.5);
        map.put("I",17.0);

        while (x < 7 && y < 7) {

            startday[x] = JOptionPane.showInputDialog(null, "Enter Day "+num+" 's Starting code");
            endday[y] = JOptionPane.showInputDialog(null, "Enter Day "+num+" 's Ending code");

            starttime = map.get(startday[x]);
            endtime = map.get(endday[y]);

            hour = endtime - starttime;
            total = total + hour;
            totalpay = total*pay;

            JOptionPane.showMessageDialog(null, "total hour" + total);
            JOptionPane.showMessageDialog(null, "total pay for the week is " + totalpay);

            x++;
            y++;
            num++;


        }

    }

}

Answer 1

您的条件如下：

else if (location == 200 && location < 300) {

翻译成英文

如果位置正好是200且小于300。

您可能想将其更改为

如果位置大于或等于200且小于300。

Answer 2

这可能就是你的if-block没有按预期工作的原因：

if (location == 100 && location < 200 ) {
    pay = 10.00;
}
else if (location == 200 && location < 300) {
    pay = 7.50;
}
else if (location == 300 && location < 400) {
    pay = 9.25;
}
else if (location == 400 && location < 500) {
    pay = 13.50;
}
else if (location == 500 && location < 600) {
    pay = 8.00;
}

根据您确定定位系统的确切方式，它应该是：

if (location < 100 ) {
    // Do something with pay here
    pay = 0.00;
}
else if (location < 200 ) {
    pay = 10.00;
}
else if (location < 300) {
    pay = 7.50;
}
else if (location < 400) {
    pay = 9.25;
}
else if (location < 500) {
    pay = 13.50;
}
else if (location < 600) {
    pay = 8.00;
}
else {
    // You should probably have some error-handling here
    // as fail-safe default for defensive programming
}

或者

if (location == 100) {
    pay = 10.00;
}
else if (location == 200) {
    pay = 7.50;
}
else if (location == 300) {
    pay = 9.25;
}
else if (location == 400) {
    pay = 13.50;
}
else if (location == 500) {
    pay = 8.00;
}
else {
    // You should probably have some error-handling here
    // as fail-safe default for defensive programming
}

Answer 3

一个简单的程序员101错误 - 您在使用OR时使用了AND。任何不是100,200,300,400,500的值都将失败，因为您希望它为100且<200等。见下文：

if (location == 100 || location < 200 ) {     
    pay = 10.00;
}
else if (location == 200 || location < 300) { 
    pay = 7.50;
}
else if (location == 300 || location < 400) {
    pay = 9.25;
}
else if (location == 400 || location < 500) {
    pay = 13.50;
}
else if (location == 500 || location < 600) {
    pay = 8.00;
}

Answer 4

您的if条件看起来很奇怪。您的意思是说>=而不是==吗？

if (location == 100 && location < 200 ) {
             ^^ should this be >= ?

顺便说一句，这些检查中有一半是不必要的：

    if (location < 100) {
    }
    else if (location < 200 ) {
        pay = 10.00;
    }
    else if (location < 300) {
        pay = 7.50;
    }
    else if (location < 400) {
        pay = 9.25;
    }
    else if (location < 500) {
        pay = 13.50;
    }
    else if (location < 600) {
        pay = 8.00;
    }

Answer 5

所有if语句都包含＆amp;＆amp;如下所示:(位置== 100 ＆amp;＆amp; 位置＆lt; 200）。这些应该替换为 || 。

＆安培;＆安培; = AND运算符
|| = OR运算符

请参阅以下更改：

if (location == 100 || location < 200 ) {
    pay = 10.00;
}
else if (location == 200 || location < 300) {
    pay = 7.50;
}
else if (location == 300 || location < 400) {
    pay = 9.25;
}
else if (location == 400 || location < 500) {
    pay = 13.50;
}
else if (location == 500 || location < 600) {
    pay = 8.00;
}

Answer 6

你真的不需要if-else乱七八糟的东西。地点图会清理它很多。

Map<String, Double> locMap = new HashMap<String, Double>();
locMap.put("100", 7.77);
locMap.put("500", 5.55);

pay = locMap.get(locStringFromInput);

为什么总支付没有正确加起来？

6 个答案: