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我已经使GUI接受输入并将其保存。当我加载输入时，我遇到了麻烦，我尝试使用缓冲读取器进行设置，并将其卡在此处。在GUI中加载缓冲的阅读器
不介意代码的注释区:)
我需要的负载方法的帮助，因为我需要从数组输入它来添加输入，并将其与上一个<和未来移动>。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
//begining of a class that will implement Action listener
public class Orders extends JFrame implements ActionListener {
//instance variables, text field and buttons
private int index;
JFrame jf;
JTextField jtfItemName;
JTextField jtfNumberOf;
JTextField jtfCost;
JTextField jtfAmountOwned;
JButton jbCalculate;
JButton jbSave;
JButton jbClear;
JButton jbExit;
double calculate;
JButton jbLoad;
JButton jbPrev;
JButton jbNext;
String itemName;
String numberOf;
String cost;
String amountOwned;
ArrayList <String> lines;
String split = ", ";
//gui implementation
public Orders() {
index = 0;
lines = new ArrayList < >();
jf = new JFrame(" Orders Calculator");
//pannels
JPanel pnl = new JPanel();
pnl.setLayout(new GridLayout(0, 2));
JLabel jlFirst = new JLabel("Item name :");
jlFirst.setHorizontalAlignment(JLabel.RIGHT);
jtfItemName = new JTextField(10);
pnl.add(jlFirst);
pnl.add(jtfItemName);
JLabel jlSecond = new JLabel("Number of :");
jlSecond.setHorizontalAlignment(JLabel.RIGHT);
jtfNumberOf = new JTextField(10);
pnl.add(jlSecond);
pnl.add(jtfNumberOf);
JLabel jlThird = new JLabel("Cost");
jlThird.setHorizontalAlignment(JLabel.RIGHT);
jtfCost = new JTextField(10);
pnl.add(jlThird);
pnl.add(jtfCost);
JLabel jlFourth = new JLabel("Amount owned :");
jlFourth.setHorizontalAlignment(JLabel.RIGHT);
jtfAmountOwned = new JTextField(10);
jtfAmountOwned.setEditable(false);
pnl.add(jlFourth);
pnl.add(jtfAmountOwned);
JPanel jpSouth = new JPanel(new BorderLayout());
JPanel jpSouthUp = new JPanel();
JPanel jpSouthDown = new JPanel();
jpSouth.add(jpSouthUp, BorderLayout.NORTH);
jpSouth.add(jpSouthDown, BorderLayout.SOUTH);
//buttons top
jbCalculate = new JButton("Calculate");
jbSave = new JButton("Save");
jbClear = new JButton("Clear");
jbExit = new JButton("Exit");
jpSouthUp.add(jbCalculate);
jpSouthUp.add(jbSave);
jpSouthUp.add(jbClear);
jpSouthUp.add(jbExit);
//buttons bottom
jbLoad = new JButton("Load");
jbPrev = new JButton("<Prev");
jbNext = new JButton("Next>");
jpSouthDown.add(jbLoad);
jpSouthDown.add(jbPrev);
jpSouthDown.add(jbNext);
jf.add(pnl);
jf.add(jpSouth, BorderLayout.SOUTH);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//action listener
jbCalculate.addActionListener(this);
jbSave.addActionListener(this);
jbClear.addActionListener(this);
jbExit.addActionListener(this);
jbLoad.addActionListener(this);
jbPrev.addActionListener(this);
jbNext.addActionListener(this);
}
public double calc() {
double number = Double.parseDouble(jtfNumberOf.getText());
double cost = Double.parseDouble(jtfCost.getText());
// double sum = number * cost;
// calculate = "" + sum;
// jtfAmountOwned.setText(calculate);
calculate = number * cost;
jtfAmountOwned.setText(calculate + "");
return calculate;
}
//parametar constructor
public Orders(String itemName, String numberOf, String cost, String amountOwned) {
this.itemName = itemName;
this.numberOf = numberOf;
this.cost = cost;
this.amountOwned = amountOwned;
}
public void setItemName(String itemName) {
this.itemName = itemName;
}
public String getItemName() {
return itemName;
}
public void setNumberOf(String numberOf) {
this.numberOf = numberOf;
}
public String getNumberOf() {
return numberOf;
}
public void setCost(String cost) {
this.cost = cost;
}
public String getCost() {
return cost;
}
public void setAmountOwned(String amountOwned) {
this.amountOwned = amountOwned;
}
public String getAmountOwned() {
return amountOwned;
}
public void actionPerformed(ActionEvent events) {
if (events.getSource() == jbExit) {
System.exit(0);
} else if (events.getSource() == jbClear) {
jtfItemName.setText("");
jtfNumberOf.setText("");
jtfCost.setText("");
jtfAmountOwned.setText("");
} else if (events.getSource() == jbCalculate) {
calc();
} else if (events.getSource() == jbSave) {
try {
PrintWriter pV = new PrintWriter(new BufferedWriter(new FileWriter("121lab1.csv", true)));
pV.println("' " + jtfItemName.getText() + "', " + jtfNumberOf.getText() + ", " + jtfCost.getText() + ", " + calc());
pV.close();
} catch (FileNotFoundException ex) {
System.out.println("File not found");
} catch (IOException ioe) {
System.out.println("IOExcetion");
} catch (Exception e) {
System.out.println("General exception");
}
} else if (events.getSource() == jbLoad) {
BufferedReader br = null;
String line = null;
try {
br = new BufferedReader(new FileReader("121Lab1.csv"));
while ((line = br.readLine()) != null) {
lines.addAll(Arrays.asList(line.split(",[ ]*")));
}
} catch (FileNotFoundException ex) {
System.out.println("File not found");
} catch (IOException ioe) {
System.out.println("IOExcetion");
} catch (Exception e) {
System.out.println("General exception");
}
System.out.println(lines.size());
} else if (events.getActionCommand().equals("Next>") || events.getActionCommand().equals("<Prev")) {
move(events.getActionCommand());
}
}
public void move(String where) {
if (where.equals("Next>")) {
if ((index + 4) >= lines.size())
JOptionPane.showMessageDialog(jf, "No more entries");
else {
//String[] name = line.split(split);
//name nameNext = new name();
/*index = index + 4;
jtfItemName.setText(lines.get(index));
jtfCost.setText(lines.get(index+2));
jtfNumberOf.setText(lines.get(index + 1));
jtfAmountOwned.setText(lines.get(index + 3));*/
}
} else if (where.equals("<Prev")) {
if ((index - 4) < 0)
JOptionPane.showMessageDialog(jf, "No more entries");
else {
/*index = index - 4;
jtfItemName.setText(lines.get(index));
jtfCost.setText(lines.get(index+2));
jtfNumberOf.setText(lines.get(index + 1));
jtfAmountOwned.setText(lines.get(index + 3));*/
}
} else {
jtfItemName.setText(lines.get(0));
jtfCost.setText(lines.get(2));
jtfNumberOf.setText(lines.get(1));
jtfAmountOwned.setText(lines.get(3));
}
}
public static void main(String[] args) {
Orders test = new Orders();
}
}
您可以创建一个SSCEE。 – Leonid