我正在上课。基本上,该程序会浏览当天的一些销售信息,并在最后打印报告。
我唯一的问题是该程序似乎最终没有退出。当我输入"完成"对于员工姓名,它会打印报告,但程序会循环返回并继续运行,要求员工重新开始销售。
我无法弄清楚程序为什么会这样做。如果有人可以帮助指出我导致它循环而不是退出的原因,以便我可以修复它,将非常感激。谢谢!
import java.io.*;
import java.text.DecimalFormat;
public class Project04Driver {
public static void main(String args[]) throws IOException {
Project04 app;
app = new Project04();
app.appMain();
}
}
class Project04 {
private static DecimalFormat df2 = new DecimalFormat ("$#,###.00");
BufferedReader stdin;
int trans, tCount;
double ytd, amount, empTotal, empBonus, totA, totF, totS, totSales, totYtd, hiTrans, ytdSales;
String date, hiEmp, name, type;
public void appMain() throws IOException {
rptInit();
displayHeader();
getDate();
while (!name.equalsIgnoreCase("Done")) {
salesData();
}
}
void rptInit() {
name = "f";
trans = 1;
amount = totF = totA = totS = totSales = totYtd = hiTrans = ytdSales = 0;
stdin = new BufferedReader(new InputStreamReader(System.in));
}
void displayHeader() {
System.out.println("--------------------------------------------");
System.out.println("Project #04 Solution");
System.out.println("Written by Jordan Hawkes");
System.out.println("--------------------------------------------");
System.out.println("");
}
void getDate() throws IOException {
System.out.print("Enter Date: ");
date = stdin.readLine();
}
void salesData() throws IOException {
System.out.print("Enter Name: ");
name = stdin.readLine();
if (name.equalsIgnoreCase("done")) {
rptOut();
return;
}
System.out.print("Enter Year to Date Sales: ");
ytd = Double.parseDouble(stdin.readLine());
ytdSales = ytdSales + ytd;
totYtd = totYtd + ytdSales;
trans();
}
void trans() throws IOException {
while (trans != 0) {
System.out.print("Enter Transaction Number: ");
trans = Integer.parseInt(stdin.readLine());
if (trans == 0) {
outputSalesData();
empTotal = 0;
empBonus = 0;
ytdSales = 0;
trans = 1;
salesData();
} else {
System.out.print("Enter Transaction Type: ");
type = stdin.readLine();
System.out.print("Enter Transaction Amount: ");
amount = Double.parseDouble(stdin.readLine());
totSales = totSales + amount;
totYtd = totYtd + amount;
ytdSales = ytdSales + amount;
empTotal = empTotal + amount;
empBonus = empBonus + (amount * 0.05);
outputUpdate();
calcSalesData();
tCount++;
}
}
}
void calcSalesData() {
if (type.equalsIgnoreCase("F")) {
totF = totF + amount;
}
if (type.equalsIgnoreCase("A")) {
totA = totA + amount;
}
if (type.equalsIgnoreCase("S")) {
totS = totS + amount;
}
hiTrans();
}
void hiTrans() {
if (amount > hiTrans) {
hiTrans = amount;
hiEmp = name;
}
}
void outputUpdate() {
System.out.println("");
System.out.println("--------------------------------------------");
System.out.println(name + "'s Total Sales for Day: " + df2.format(empTotal));
System.out.println("--------------------------------------------");
System.out.println("");
}
void outputSalesData() {
System.out.println("");
System.out.println("--------------------------------------------");
System.out.println("Employee Name: \t\t" + name);
System.out.println("YTD Sales: \t\t" + df2.format(ytdSales));
System.out.println("Employee Bonus: \t" + df2.format(empBonus));
System.out.println("--------------------------------------------");
System.out.println("");
}
void rptOut() {
System.out.println("Total Food & Soft Drink Sales: \t" + df2.format(totF));
System.out.println("Total Alcohol Sales: \t\t" + df2.format(totA));
System.out.println("Total Sundries Sales: \t\t" + df2.format(totS));
System.out.println("--------------------------------------------");
System.out.println("Total Sales for Day: \t\t" + df2.format(totSales));
System.out.println("Total YTD: \t\t\t" + df2.format(totYtd));
System.out.println("--------------------------------------------");
System.out.println("Highest Trans Amount: \t\t" + df2.format(hiTrans));
System.out.println("Employee w/ Highest Trans: \t" + hiEmp);
System.out.println("--------------------------------------------");
return;
}
}
答案 0 :(得分:1)
为了让程序自然退出,你不应该在一个循环中调用方法,而是允许方法退出并控制来自主循环的流程。
这是重新设计的方法:
新的主循环调用一对中的salesData()
和trans()
(假设名称不是"已完成")
while (!name.equalsIgnoreCase("Done")) {
salesData();
if (!name.equalsIgnoreCase("Done"))
trans();
}
现在,方法salesData()
不得调用trans()
:
void salesData() throws IOException {
System.out.print("Enter Name: ");
name = stdin.readLine();
if (name.equalsIgnoreCase("done")) {
rptOut();
return;
}
// ... processing ...
}
并且trans()
也不得致电salesData()
:
void trans() throws IOException {
while (trans != 0) {
System.out.print("Enter Transaction Number: ");
trans = Integer.parseInt(stdin.readLine());
if (trans == 0) {
outputSalesData();
empTotal = 0;
empBonus = 0;
ytdSales = 0;
} else {
System.out.print("Enter Transaction Type: ");
type = stdin.readLine();
System.out.print("Enter Transaction Amount: ");
amount = Double.parseDouble(stdin.readLine());
// ... processing ...
outputUpdate();
calcSalesData();
tCount++;
}
}
}
总结:现在方法salesData()
和trans()
没有相互调用(它们在完成方法后自然返回),并且由于控件现在来自主循环,因此应用程序将退出预期
答案 1 :(得分:0)
在我的独立Java程序中,以下调用是这样做的:
System.exit(0);
答案 2 :(得分:0)
你不能归0;来自salesData?
答案 3 :(得分:0)
我不能直接在你的问题中评论,所以我会把它放在这里。我认为问题在于你调用salesData():
-in appMain()你没有做出选择"完成"在你的while循环中,它永远不会结束。
希望这能解决问题!
答案 4 :(得分:0)
trans()和appMain()调用salesData()。如果通过trans()调用salesData(),那么salesData()中的返回将返回到trans(),它本身具有while循环。