我的程序需要一些帮助。使用类似的示例程序，我能够获得我需要做的所有事情的基本布局。现在我的主要问题是我的代码是否正确第一部分。我希望它将我的数据文件中的数据读入并行数组。我包含了我的整个程序以供参考布局，但是现在我只是想将数据文件读入一个数组。任何帮助是极大的赞赏。如果需要更多信息或我的格式错误，请告诉我。
数据文件（patient.txt）：
11111，史密斯，诺里斯，甲状腺，1000.00
11112，奥巴马，诺里斯，LASEK，500.00
11113，胡佛，诺里斯，牙科，100.00
11114，以上的价格，诺里斯，LASEK，500.00
11115，勒托，诺里斯，甲状腺，1000.00
22221，克拉克，债券，甲状腺，1000.00
22222，长安，债券，LASEK，500.00
22223，登特，债券，牙科，100.00
22224，尼克松，债券，LASEK，500.00
22225，华盛顿，债券，牙科，100.00
33331，琼斯，李，牙科，100.00
33332，罗斯，李，LASEK，500.00
33333，盖茨，李，甲状腺，1000.00
33334，约翰逊，李，甲状腺，1000.00
33335，卡特，李，牙科，100.00
程序（类是Patient_Reports）
`
import javax.swing.JOptionPane;
import java.io.*;
import java.util.*;
public class Patient_Reports {
public static void main(String[] args)
{
int selection;
String pnumber;
Patient_Reports patient = new Patient_Reports();
patient.start_system();
pnumber = patient.menu();
selection = Integer.parseInt(pnumber);
while(selection !=3)
{
if(selection==1)
patient.All_Information_Report();
else
if(selection==2)
patient.Surgeries_Doctor_Report();
else
if(selection==3)
patient.Surgeries_Type_Report();
else
if(selection==4)
patient.Doctor_Fees_Report();
else
if(selection==5)
patient.Average_Fees_Report();
pnumber = patient.menu();
selection = Integer.parseInt(pnumber);
}//while loop
patient.Exit();
System.exit(0);
}//main method
//Read Data File
int count=-1,i;
int [] id = new int [10];
String [] patient = new String [10];
String [] doctor = new String [10];
String [] surgery = new String [10];
double [] cost = new double [10];
void start_system()
{
String newLine;
try
{
//define a file valiable for Buffered read
BufferedReader Patient_Reports = new BufferedReader(new FileReader("patient.txt"));
//read lines in file until there are no more lines in the file to read
while ((newLine = Patient_Reports.readLine()) != null)
{
//there is a "," between each data item in each line
StringTokenizer delimiter = new StringTokenizer(newLine,",");
count=count+1;
id[count] = Integer.parseInt(delimiter.nextToken());
patient[count] =delimiter.nextToken();
doctor[count] =delimiter.nextToken();
surgery[count] =delimiter.nextToken();
cost[count] = Double.parseDouble(delimiter.nextToken());
}//while loop
Patient_Reports.close();
}//end try
catch (IOException error)
{
//there was an error on the file writing
System.out.println("Error on file read " + error);
}//error on read
}//end start_system
//Method for Menu of Reports
String menu()
{
String pnum;
String Output = "Reports" + "\n" +"1. All_Information_Report" + "\n" +
"2. Surgeries_Doctor_Report" + "\n" +
"3. Surgeries_Type_Report" + "\n" +
"4. Doctor_Fees_Report" + "\n" +
"5. Average_Fees_Report" + "\n" +
"6. Exit" + "\n" +
" " + "\n" +
"Select a Report >";
pnum = JOptionPane.showInputDialog(null,
Output, "",JOptionPane.QUESTION_MESSAGE);
return pnum;
}//end menu
/ *报告的占位符
//All_Information_Report Report containing all of the information
void All_Information_Report()
{
System.out.println("All_Information_Report");
for (i=0; i<=count; ++i)
{
System.out.println(id[i] + " " + patient[i] + " " + doctor[i] + " " + surgery[i] + " " + cost[i] + " ");
}//for loop
}//end report
//Surgeries_Doctor_Report Report on all surgeries of a specific doctor (prompt for the doctor)
void Surgeries_Doctor_Report()
{
System.out.println("Surgeries_Doctor_Report");
for (i=0; i<=count; ++i)
{
System.out.println(id[i] + " " + patient[i] + " " + doctor[i] + " " + surgery[i] + " " + cost[i] + " ");
}//for loop
}//end report
//Surgeries_Type_Report Report on all surgeries of a specific type(Prompt for the surgery type)
void Surgeries_Type_Report()
{
System.out.println("Surgeries_Type_Report");
for (i=0; i<=count; ++i)
{
System.out.println(id[i] + " " + patient[i] + " " + doctor[i] + " " + surgery[i] + " " + cost[i] + " ");
}//for loop
}//end report
//Doctor_Fees_Report Report on the total amount of fees paid to each doctor
void Doctor_Fees_Report()
{
System.out.println("Doctor_Fees_Report");
for (i=0; i<=count; ++i)
{
System.out.println(id[i] + " " + patient[i] + " " + doctor[i] + " " + surgery[i] + " " + cost[i] + " ");
}//for loop
}//end report
//Average_Fees_Report Report on the Average Fee
void Average_Fees_Report()
{
System.out.println("Average_Fees_Report");
for (i=0; i<=count; ++i)
{
System.out.println(id[i] + " " + patient[i] + " " + doctor[i] + " " + surgery[i] + " " + cost[i] + " ");
}//for loop
}//end report
* / //将数据文件存储在数组中
void Exit()
{
try
{
BufferedWriter Patient_Reports = new BufferedWriter(new FileWriter("patient.txt"));
for (i=0; i<=count; ++i)
{
//put "," between each data item in the file
Patient_Reports.write(id[i] + "," + patient[i] + "," + doctor[i]+ "," + surgery[i] + ","+ cost[i]+ ",");
//write a new line in the file
Patient_Reports.newLine();
}//for loop
Patient_Reports.close();
}//end try
catch (IOException error)
{
//there was an error on the write to file
System.out.println("Error on file write " + error);
}//end error
}//end class
} //结束exit_system`
答案 0 :(得分：1)
首先，您的代码非常令人困惑，违反了几项OOP编程惯例。
第一个（也是最令人震惊的）问题是您的静态类Patient_Reports包含main方法但不使用此静态入口点来声明对象或前进。因此，您可以像这样重新格式化代码：
public class Patient_Reports {
Patient_Reports fields...
public Patient_Report() {
//start work here in Constructor
}
Patient_Reports methods...
public static void main(String[] args) {
new Patient_Reports();
}
}
要解决您的主要问题，您可能想要在类中调用某种通用方法，如下所示：
public static void writePatientReports(int[] id, String[] patient,
String[] doctor, String[] surgery, double[] cost) {
BufferedWriter Student_file = new BufferedWriter(new FileWriter("patient.txt"));
for (i=0; i<=count; ++i)
{
//put "," between each data item in the file
Student_file.write(id[i] + "," + patient[i] + "," + doctor[i]+ "," + surgery[i] + ","+ cost[i]+ ",");
//write a new line in the file
Student_file.write("\n");
}//for loop
Student_file.close();
}
您收到错误的原因是因为您没有像write()或newLine()那样附加到Patient_Reports的方法。即使你有，你也会不必要地将Student_file声明为BufferedWriter对象。
此外，通过阅读Java Code Conventions
，您将大大提高您对Java和一般OOP的了解