Java 使用对话框创建工程量清单（每次我尝试运行它时都会终止）？

所以我一直在为这个提示挣扎一段时间。基本上，我需要使用对话框来创建一个用于建筑公司计费的程序。提示如下。第一：从单独的对话框中读取以下数据。这需要针对施工公司的名称、客户的名称、工头的工时数、工人人数、工作天数以及最终的材料成本进行。第二：必须根据从对话框中获得的信息计算以下内容。计算如下：工头人工成本=工头人工时数乘以60，工人人工成本=天数乘以每天8小时乘以工人人数乘以30美元，工作费=工头人工成本+工人人工成本+材料，折扣=工作费乘以10%，最终应付金额=工作费-折扣。最后，必须打印所有数据。输出应类似于建筑公司名称，客户：xxxxx，天数=xxxxx，工头人工成本=xxxxx，工人人工成本=xxxxx，材料成本=xxxxx，工作费=xxxxx，折扣=xxxxx，最终到期金额=xxxxx。我的问题是，我无法使用对话框中的信息运行代码以生成所需的输出？每次我尝试运行该程序时，它都会被终止，因此我有点困惑，因为我对Java相当陌生，因此希望您能提供任何帮助。到目前为止，我拥有的代码如下：

package bill;
import javax.swing.JOptionPane;
public class ContractorBill 
{
public static void main(String[]args) {
    }
double forhours,workers,daysonjob,costofmaterials,flcost,wlcost,jobfee,discount,finalamount;
String fname,cname,forstring,wstring,dojstring,comstring,printdata="";{

fname=JOptionPane.showInputDialog(null,"Enter the name of the construction firm","Input Data",JOptionPane.QUESTION_MESSAGE);
cname=JOptionPane.showInputDialog(null,"Enter the customer's name","Input Data",JOptionPane.QUESTION_MESSAGE);
forstring=JOptionPane.showInputDialog(null,"Enter the number of labor hours required for the foreman","Input",JOptionPane.QUESTION_MESSAGE);
wstring=JOptionPane.showInputDialog(null, "Enter the number of workers required","Input",JOptionPane.QUESTION_MESSAGE);
dojstring=JOptionPane.showInputDialog(null,"Enter the number of days required to complete the job","Input",JOptionPane.QUESTION_MESSAGE);
comstring=JOptionPane.showInputDialog(null,"Enter the cost of materials required for the job"+"Input",JOptionPane.QUESTION_MESSAGE);

forhours=Double.parseDouble(forstring);
workers=Double.parseDouble(wstring);
daysonjob=Double.parseDouble(dojstring);
costofmaterials=Double.parseDouble(comstring);

flcost=60*(forhours);
wlcost=8*(daysonjob)+30*(workers);
jobfee=(flcost)+(wlcost)+(costofmaterials);
discount=(jobfee)*0.10;
finalamount=(jobfee)-(discount);

printdata=printdata+"CONSTRUCTION FIRM NAME="+fname+"\n"+
"CUSTOMER:"+cname+"\n"+
"Number of days ="+daysonjob+"\n"+
"Forman labor cost ="+flcost+"\n"+
"Worker Labor Cost ="+wlcost+"\n"+
"Materials cost ="+costofmaterials+"\n"+
"Job Fee ="+jobfee+"\n"+
"Discount ="+discount+"\n"+
"Final Amount Due ="+finalamount+"\n";
JOptionPane.showMessageDialog(null,printdata,"Output:",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);

}}

---

main

方法是唯一一个自动调用的方法，并且它不包含会导致它不立即终止的语句

请参阅此修改后的版本，并仔细阅读代码注释：

import javax.swing.JOptionPane;

public class ContractorBill {

    double forhours, workers, daysonjob, costofmaterials, flcost, wlcost, jobfee, discount, finalamount;
    String fname, cname, forstring, wstring, dojstring, comstring, printdata = "";

    public static void main(String[] args) {
        new ContractorBill(); // call the (newly added) constructor
    }

    // this has now been turned from a code block into a constructor
    ContractorBill() { 

        fname = JOptionPane.showInputDialog(null, "Enter the name of the construction firm", "Input Data", JOptionPane.QUESTION_MESSAGE);
        cname = JOptionPane.showInputDialog(null, "Enter the customer's name", "Input Data", JOptionPane.QUESTION_MESSAGE);
        forstring = JOptionPane.showInputDialog(null, "Enter the number of labor hours required for the foreman", "Input", JOptionPane.QUESTION_MESSAGE);
        wstring = JOptionPane.showInputDialog(null, "Enter the number of workers required", "Input", JOptionPane.QUESTION_MESSAGE);
        dojstring = JOptionPane.showInputDialog(null, "Enter the number of days required to complete the job", "Input", JOptionPane.QUESTION_MESSAGE);
        comstring = JOptionPane.showInputDialog(null, "Enter the cost of materials required for the job" + "Input", JOptionPane.QUESTION_MESSAGE);

        forhours = Double.parseDouble(forstring);
        workers = Double.parseDouble(wstring);
        daysonjob = Double.parseDouble(dojstring);
        costofmaterials = Double.parseDouble(comstring);

        flcost = 60 * (forhours);
        wlcost = 8 * (daysonjob) + 30 * (workers);
        jobfee = (flcost) + (wlcost) + (costofmaterials);
        discount = (jobfee) * 0.10;
        finalamount = (jobfee) - (discount);

        printdata = printdata + "CONSTRUCTION FIRM NAME=" + fname + "\n"
                + "CUSTOMER:" + cname + "\n"
                + "Number of days =" + daysonjob + "\n"
                + "Forman labor cost =" + flcost + "\n"
                + "Worker Labor Cost =" + wlcost + "\n"
                + "Materials cost =" + costofmaterials + "\n"
                + "Job Fee =" + jobfee + "\n"
                + "Discount =" + discount + "\n"
                + "Final Amount Due =" + finalamount + "\n";
        JOptionPane.showMessageDialog(null, printdata, "Output:", JOptionPane.INFORMATION_MESSAGE);
        System.exit(0);
    }
}

---

那么，你的问题是什么？您已经列出了三个需求，并展示了一些代码，但没有说明您的困境。请参阅：在问题主体中，首先展开标题中的摘要。解释你是如何遇到你试图解决的问题的，以及任何阻碍你自己解决问题的困难。我们不知道你的困难在哪里。另外，这里的问题格式是这样的，如果你有三个单独的问题，请发三篇帖子。