所以，我有一个涵盖很多内容的任务。我需要：
- 有一个底部有两个按钮的 GUI。两个按钮都从我的临时文件夹中获取一个单独的文件。
- 我必须使用我们过去使用的方法（collectGrades 和averageGrade），并在单击第二个按钮时将该数据输出到中间的文本字段框
我需要从studentscores.txt（这是一个int字段和一个double字段）中获取数据并将它们放入StringBuilder中，然后将stringBuilder输出到jTextframe上。
private void jbtReadFileActionPerformed2(ActionEvent evt) {
try {
File inFile = new File("c:/temp/studentscores.txt");
Scanner input = new Scanner(inFile);
String fileContents = "";
while(input.hasNext()) {
students.add(new Student(input.nextInt(),input.nextLine()));
} // end while
for(int o = 0;o < students.size();o++) {
students.get(o).setGrades(collectGrades(students.get(o).getStuId()));
jtxtAfileContents.setText("%-10d %-20s %.2f\n", students.get(o).getStuId(), students.get(o).getStuName(), averageGrade(students.get(o).getGrades())););
我怎样才能让它工作？
import java.awt.*
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import javax.swing.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class P_Supplemental_11 extends JFrame {
JPanel jpnl1 = new JPanel();
JPanel southPanel = new JPanel();
JButton jbtReadFile1 = new JButton("Get Student Names");
JButton jbtReadFile2 = new JButton("Get Student Grades");
JTextField jtxtFilePath = new JTextField();
JLabel jlblDesc = new JLabel("Click a button to open each file!");
JTextArea jtxtAfileContents = new JTextArea();
P_Supplemental_11() {
this.setLayout(new BorderLayout(5, 10));
jpnl1.setLayout(new GridLayout(2, 2));
jpnl1.add(jlblDesc);
//jpnl1.add(jtxtFilePath);
southPanel.add(jbtReadFile1);
southPanel.add(jbtReadFile2);
add(southPanel, BorderLayout.SOUTH);
add(jpnl1, BorderLayout.NORTH);
add(jtxtAfileContents, BorderLayout.CENTER);
jbtReadFile1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jbtReadFileActionPerformed(evt);
}
});
jbtReadFile2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jbtReadFileActionPerformed2(evt);
}
});
} // end constructor
class Student {
private int stuId;
private String stuName;
private ArrayList<Double> grades;
Student(int idIn, String nameIn) {
this.stuId = idIn;
this.stuName = nameIn;
} // end student class
public int getStuId() {
return stuId;
}
public void setStuId(int stuId) {
this.stuId = stuId;
}
String getStuName() {
return stuName;
}
public void setStuName(String stuName) {
this.stuName = stuName;
}
public ArrayList<Double> getGrades() {
return grades;
}
public void setGrades(ArrayList grades) {
this.grades = grades;
}
} // end class Student
ArrayList<Student> students = new ArrayList();
private void jbtReadFileActionPerformed(ActionEvent evt) {
try {
File inFile = new File("c:/temp/studentnames.txt");
Scanner input = new Scanner(inFile);
String fileContents = "";
while(input.hasNext()) {
fileContents+= input.nextLine() + "\n";
} // end while
jtxtAfileContents.setText(fileContents);
input.close();
} // end action method for jbtReadFile button
catch (FileNotFoundException ex) {
Logger.getLogger(P_Supplemental_11.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void jbtReadFileActionPerformed2(ActionEvent evt) {
try {
File inFile = new File("c:/temp/studentscores.txt");
Scanner input = new Scanner(inFile);
String fileContents = "";
while(input.hasNext()) {
students.add(new Student(input.nextInt(),input.nextLine()));
} // end while
for(int o = 0;o < students.size();o++) {
students.get(o).setGrades(collectGrades(students.get(o).getStuId()));
jtxtAfileContents.setText("%-10d %-20s %.2f\n", students.get(o).getStuId(), students.get(o).getStuName(), averageGrade(students.get(o).getGrades())););
/*String fileContents = "";
while(input.hasNext()) {
fileContents+= input.nextLine() + "\n";
} // end while
input.close();
jtxtAfileContents.setText(collectGrades.getStuName);
*/
}
} // end action method for jbtReadFile button
catch (FileNotFoundException ex) {
Logger.getLogger(P_Supplemental_11.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static ArrayList <Double> collectGrades(int inId) {
ArrayList <Double> outGrade = new ArrayList();
try {
File inFile = new File("c:/temp/studentScores.txt");
Scanner input = new Scanner(inFile);
while(input.hasNext()) {
int tmpInt = input.nextInt();
double tmpDbl = input.nextDouble();
if(tmpInt == inId) {
outGrade.add(tmpDbl);
} // end if
} // end while
} catch (FileNotFoundException ex) {
Logger.getLogger(P_Supplemental_11.class.getName()).log(Level.SEVERE, null, ex);
} // end catch
return outGrade;
} // end method
public static double averageGrade(ArrayList <Double> gradeIn) {
double outAvg = 0.0;
for(int y = 0; y < gradeIn.size();y++) {
outAvg+= gradeIn.get(y);
} // end for
return outAvg/gradeIn.size();
}
public static void main(String[] args) {
P_Supplemental_11 frame = new P_Supplemental_11();
frame.setTitle("P_Supplemenetal_10");
frame.setSize(410, 520);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
} // end main
} // end public class P_Supp_11
