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我已经寻找了 40 多分钟,试图在这个网站上找到可能与我的问题有关的答案,但无济于事。

我难住了。我正在尝试将程序转换为 GUI。我正在使用 Textpad,它在编译时告诉我该变量已在 main 方法中定义。然后当转换为 int 或 double 时,它​​告诉我它找不到符号并指向我要转换的变量。然后在我的计算过程中,它告诉我二元运算符“*”的操作数类型错误。

import javax.swing.JOptionPane;

public class PayrollGUI {

// calculates payroll
public static void main (String [] args) {

String name = JOptionPane.showInputDialog ("Employee's Name: ");
int name = Integer.parseInt(nameString);

String hours = JOptionPane.showInputDialog ("Number of hours worked in a week (e.g., 10: ");
int hours = Integer.parseInt(hoursString);

String payRate = JOptionPane.showInputDialog ("Hourly pay rate (e.g., .6.75: ");
double payRate = Double.parseDouble(payRateString);

String federalTaxRate = JOptionPane.showInputDialog ("Federal tax witholding rate (e.g., .20: ");
double federalTaxRate = Double.parseDouble(federalTaxRateString);

String stateTaxRate = JOptionPane.showInputDialog (" State tax witholding rate (e.g., .09: ");
double stateTaxRate = Double.parseDouble(stateTaxRateString);

//calculate witholdings, grosspay and netpay
double federalWitholding = federalTaxRate * (hours * payRate);
double stateWitholding = stateTaxRate * (hours * payRate);
double grossPay = hours * payRate;
double netPay = grossPay - withholdings;
double witholdings = federalWithodling + stateWitholding;

//format to keep two digit decimal
witholdings = (int) (witholdings * 100) /100.0;
netPay = (int) (netPay * 100) / 100.0;
grossPay = (int) (grossPay * 100) / 100.0;
federalWitholding = (int) (federalWitholding * 100) / 100.0;
stateWitholding = (int) (stateWitholding *100) / 100.0;

/*String output = (null);
String output = (null);*/
String output = "Employee Name: " + name +
"/nHours Worked: "  + hours +
"/nPay Rate: $" + payRate +
"/nGross Pay: $" + grossPay +
"/nDeductions:" +
"/n     Federal Witholding: $" + federalWitholding +
"/n     State Witholding : $" + stateWitholding +
"/n     Total Deductions : $" + witholdings +
"/n     Net Pay: $";
JOptionPane.showMessageDialog(null, output);
}//end main
}//end Payroll
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3 回答 3

5
String name = ...;
int name = ...;

做不到。

替换String name为,String nameString因为这是您在使用时尝试解析的变量Integer.parseInt!(也不要忘记所有其他变量!)

例如

String hoursString hoursString
String payRateString payRateString
String federalTaxRateString federalTaxRateString
String stateTaxRateString stateTaxRateString

于 2013-01-29T04:08:48.807 回答
5
  1. 您无法编译,因为name, hours, payRate, .... 变量被声明了两次。将它们中的每一个更改为另一个名称
  2. 您的parseInt,parseDouble语句不好,因为输入的格式可能不正确(字母或其他内容)。因此,您需要使用try/catch来验证您的输入
  3. witholdings = (int) (witholdings * 100) /100.0;这不是保持 2 位数格式的方法。读这个
  4. 尝试使用更好的 IDE。如果您是 Java 新手,请查看jcreatorbluej
于 2013-01-29T04:11:09.287 回答
1

在一种方法中不能有两个相同的变量名。在您的代码中,您有许多重复的变量,如下所示。同一方法中不能有两个name变量。

String name = JOptionPane.showInputDialog ("Employee's Name: ");
int name = Integer.parseInt(nameString);

如果您使用任何适用于 Java 的 IDE,例如Eclipse,您可以轻松解决此类编译问题,而不是使用 Textpad。

于 2013-01-29T04:13:39.217 回答