Previously written Java notepad

Although it was poorly written, it was still written for a long time. If eclipse is to be cleaned up, back it up:

package com.test.notepad;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JViewport;
public class Main {
JFrame frame = null;
JMenuBar jmb = null;
JMenu[] jm = null;
JMenuItem[][] jmi = null;
JScrollPane jsp = null;
JViewport port = null;
JTextArea content = null;
JFileChooser fileChooser = null;
File file = null;
boolean isSaved;
public Main() {
isSaved = true;
Frame = new JFrame ("NOTEPAD");
frame.setLayout(new BorderLayout());
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
confirmExit();
}
};
jmb = new JMenuBar();
jm = new JMenu[2];
JM [0] = new JMenu ("file");
JM [1] = new JMenu ("help");
jmb.add(jm[0]);
jmb.add(jm[1]);
jmi = new JMenuItem[2][];
jmi[0] = new JMenuItem[5];
jmi[1] = new JMenuItem[2];
/ / document
JMI [0] [0] = new jmenuitem ("new");
jmi[0][0].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jmi[0][3].setEnabled(true);
content.setEnabled(true);
isSaved = false;
}
};
JMI [0] [1] = new jmenuitem ("open");
jmi[0][1].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int ret = fileChooser.showOpenDialog(frame);
if (ret != JFileChooser.APPROVE_OPTION) {
Return;
}
file = fileChooser.getSelectedFile();
if (file == null) {
Return;
}
content.setEnabled(true);
FileReader fr = null;
Try {
fr = new FileReader(file);
Int i;
StringBuffer sb = new StringBuffer("");
while ((i = fr.read()) != -1) {
sb.append((char) i);
}
content.setText(sb.toString());
jmi[0][2].setEnabled(true);
jmi[0][3].setEnabled(true);
Fr.close ();
isSaved = false;
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
//					e1.printStackTrace();
} catch (IOException e2) {
// TODO Auto-generated catch block
//					e2.printStackTrace();
}
}
};
JMI [0] [2] = new jmenuitem ("save");
jmi[0][2].setEnabled(false);
jmi[0][2].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Save ();
}
};
JMI [0] [3] = new jmenuitem ("save as");
jmi[0][3].setEnabled(false);
jmi[0][3].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
SaveAs ();
}
};
JMI [0] [4] = new jmenuitem ("exit");
jmi[0][4].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
confirmExit();
}
};
jm[0].add(jmi[0][0]);
jm[0].add(jmi[0][1]);
jm[0].add(jmi[0][2]);
jm[0].add(jmi[0][3]);
jm[0].add(jmi[0][4]);
/ / help
JMI [1] [0] = new jmenuitem ("about");
jm[1].add(jmi[1][0]);
jsp = new JScrollPane();
port = jsp.getViewport();
content = new JTextArea();
content.setEnabled(false);
content.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent e) {
CheckSave ();
}
};
port.add(content);
fileChooser = new JFileChooser("e:/");
frame.add(jmb, BorderLayout.NORTH);
frame.add(jsp, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(400, 100, 600, 500);
frame.setVisible(true);
}
protected void confirmExit() {
if (isSaved == false) {
If (joptionpane. Showconfirmdialog (null), "are you sure you want to exit without saving? "", "
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION) {
} else{
if(file == null){
SaveAs ();
}else{
Save ();
}
}
}
System.exit(0);
}
protected void save() {
Try {
FileWriter fw = new FileWriter(file);
String str = content.getText();
System.out.println(str);
fw.write(str);
Fw.close ();
isSaved = true;
CheckSave ();
} catch (IOException e1) {
//			e1.printStackTrace();
}
}
protected void saveAs() {
int ret = fileChooser.showSaveDialog(frame);
if (ret != JFileChooser.APPROVE_OPTION) {
Return;
}
file = fileChooser.getSelectedFile();
Try {
FileWriter fw = new FileWriter(file);
fw.write(content.getText());
Fw.close ();
isSaved = true;
CheckSave ();
} catch (IOException e1) {
//			e1.printStackTrace();
}
}
protected void checkSave() {
//		System.out.println("in func checkSave():" + file);
String title = null;
if(file == null){
title = "untitled";
}else{
title = file.getName();
		}
		frame.setTitle(title);
		if(isSaved != true){
			title += " *";
		} else{
			jmi[0][2].setEnabled(true);
		}
	}

	public static void main(String[] args) {
		new Main();
	}
}

There was no comment at the time, but it should be understandable.