急求,JAVA语言高手帮我解难

[wudysion]

今天朋友给了我一个简单的JAVA 应用程序
本人网络方向,有些地方不是太懂
希望大家帮我解释一下
帮我写下每一段或句字的解释

代码如下:是一个记事本的代码

希望高手可以粘贴过后,帮我每行注释
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.color.*;
import java.awt.font.*;
import javax.swing.undo.*;

public class Note extends JFrame
{
boolean isChange=false;
boolean wasChange=false;
JMenuBar menuBar=new JMenuBar();

JMenu menuFile=new JMenu("File");
JMenuItem menuFileOpen=new JMenuItem("Open..");
JMenuItem menuFileSave=new JMenuItem("Save..");
JMenuItem menuFileExit=new JMenuItem("Exit");

JMenu menuEdit=new JMenu("Edit");
JMenuItem menuFileCut=new JMenuItem("Cut");
JMenuItem font=new JMenuItem("Font");
JMenuItem menuFilePaste=new JMenuItem("Paste");

JTextArea fileArea=new JTextArea();

public Note()
{
this.setTitle("记事本");
Toolkit tool=this.getToolkit();//窗口图标！
Image myimage=tool.getImage("戒指.jpg");
this.setIconImage(myimage);
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
exit();
}
});
menuFileOpen.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
fileOpen_actionPerformed(e);
}
});
menuFileSave.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
fileSave_actionPerformed(e);
}
});
menuFileExit.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
fileExit_actionPerformed(e);
}
});
menuFileCut.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
fileCut_actionPerformed(e);
}
});
menuFilePaste.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
filePaste_actionPerformed(e);
}
});
font.addActionListener(new ActionListener ()
{
public void actionPerformed(ActionEvent e)
{
fileColor_actionPerformed(e);
}
});
fileArea.getDocument().addDocumentListener(new DocumentListener()
{
public void insertUpdate(DocumentEvent e)
{
wasChange=isChange;
isChange=true;
}
public void removeUpdate(DocumentEvent e)
{
wasChange=isChange;
isChange=true;
}
public void changedUpdate(DocumentEvent e)
{
wasChange=isChange;
isChange=true;
}
});
setSize(500,450);
menuBar.add(menuFile);
menuFile.setMnemonic('F');
menuBar.add(menuEdit);
menuEdit.setMnemonic('E');
menuFile.add(menuFileOpen);
menuFileOpen.setMnemonic('O');//访问健;
menuFileOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));//快捷健;
menuFile.add(menuFileSave);
menuFileSave.setMnemonic('S');
menuFileSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
menuFile.addSeparator();
menuFile.add(menuFileExit);
menuFileExit.setMnemonic('E');
menuEdit.add(menuFileCut);
menuFileCut.setMnemonic('C');
menuFileCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
menuEdit.add(menuFilePaste);
menuFilePaste.setMnemonic('P');
menuFilePaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P,InputEvent.CTRL_MASK));
menuEdit.add(font);
font.setMnemonic('N');
font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK));
this.getContentPane().add(new JScrollPane(fileArea));
setJMenuBar(menuBar);
fileArea.setLineWrap(true);
}
public void fileExit_actionPerformed(ActionEvent e)
{
System.exit(0);
}
public void fileOpen_actionPerformed(ActionEvent e)
{
//以下是filter;
JFileChooser fileChooser=new JFileChooser();
//fileChooser.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)"));
fileChooser.addChoosableFileFilter(fileChooser.getFileFilter());
if(fileChooser.APPROVE_OPTION!=fileChooser.showOpenDialog(this))return;
//以下是文件读
BufferedReader dataIn=null;
try
{
dataIn=new BufferedReader(new FileReader(fileChooser.getSelectedFile().getPath()));
String c=null;
do
{
c=dataIn.readLine();
if(c!=null)
fileArea.append(c+"\n");
}
while(c!=null);
}
catch(Exception ex)
{
System.out.println("Catch exception:"+ex.toString());
}
}
public void exit()
{
if(isChange==false)
System.exit(1);
else
{
int decision=JOptionPane.showConfirmDialog(this,"The File has Change.\n"+"Do you want to save the change?",
"Notepad",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE);
if (decision == JOptionPane.YES_OPTION)
{
//以下是将文件写入计算机!
try {
JFileChooser fileSave = new JFileChooser();
fileSave.setDialogTitle("保存文件");
//fileSave.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)"));
fileSave.addChoosableFileFilter(fileSave.getFileFilter());
if (fileSave.APPROVE_OPTION != fileSave.showSaveDialog(this))
return;
BufferedWriter dataOut = new BufferedWriter(new BufferedWriter(new
FileWriter(fileSave.getSelectedFile())));
String c = null;
do {
String str = fileArea.getText();
dataOut.write(str);
dataOut.close();
}
while (c != null);
}
catch (Exception e2) {
System.out.println("Catch exception:有错误!" + e2.toString());
}
}
else if (decision == JOptionPane.NO_OPTION)
System.exit(1);
else if (decision == JOptionPane.CANCEL_OPTION);
;
}
//innerclass.fileSave_actionPerformed();
}
public void fileSave_actionPerformed(ActionEvent e1)
{

//以下是将文件写入计算机!
try
{
JFileChooser fileSave=new JFileChooser();
fileSave.setDialogTitle("保存文件" );
//fileSave.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)"));
fileSave.addChoosableFileFilter(fileSave.getFileFilter());
if(fileSave.APPROVE_OPTION!=fileSave.showSaveDialog(this))return;
BufferedWriter dataOut=new BufferedWriter(new BufferedWriter(new FileWriter(fileSave.getSelectedFile()+".txt")));
//RandomAccessFile dataOut=new RandomAccessFile(fileSave.getSelectedFile(),"rw");
String c=null;
do
{
String str=fileArea.getText();
dataOut.write(str);
dataOut.close();
}
while(c!=null);
}
catch(Exception e2)
{
System.out.println("Catch exception:有错误!"+e2.toString());
}
}
public static void main(String arg[])
{
Note nt=new Note();
nt.show();
}
public void fileCut_actionPerformed(ActionEvent e)
{
fileArea.cut();
}
public void filePaste_actionPerformed(ActionEvent e)
{
fileArea.paste();
}
public void fileColor_actionPerformed(ActionEvent e)
{
JColorChooser fileColor=new JColorChooser();
//fileArea.setForeground(fileColor.showDialog(this,"颜色",Color.red));
//fileArea.setSelectionColor(fileColor.showDialog(this,"颜色",Color.red));
fileArea.setSelectionColor(fileColor.showDialog(this,"颜色",Color.black));
}
}

[lixinbill]

大哥啊...你这代码这么长,还要每句话都写注释啊..会累死人的(先声明我也是小菜鸟,会写的话一定帮你写)

[snake09003232]

你朋友也真是的,写代码不写注释~~~把他拉出去~~~~

[olivesoup]

这活不太原意干..

[yiyi_wx]

package infant.query;


import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.color.*;
import java.awt.font.*;
import javax.swing.undo.*;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2007</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */

public class Note extends JFrame {
    boolean isChange = false;
    boolean wasChange = false;
    JMenuBar menuBar = new JMenuBar();//实例菜单栏

    JMenu menuFile = new JMenu("File");//实例"File"菜单
    JMenuItem menuFileOpen = new JMenuItem("Open..");//实例“File”菜单下的“Open..”选项
    JMenuItem menuFileSave = new JMenuItem("Save..");
    JMenuItem menuFileExit = new JMenuItem("Exit");

    JMenu menuEdit = new JMenu("Edit");
    JMenuItem menuFileCut = new JMenuItem("Cut");
    JMenuItem font = new JMenuItem("Font");
    JMenuItem menuFilePaste = new JMenuItem("Paste");

    JTextArea fileArea = new JTextArea();

    public Note() {
        this.setTitle("记事本");
        Toolkit tool = this.getToolkit(); //窗口图标！
        Image myimage = tool.getImage("戒指.jpg");
        this.setIconImage(myimage);
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);//设置用户在此窗体上发起 "close" 时默认执行的操作。“DO_NOTHING_ON_CLOSE”是指关闭的时候什么都不做
        addWindowListener(new WindowAdapter() {//添加指定的窗口侦听器
            public void windowClosing(WindowEvent e) {
                exit();
            }
        });
        menuFileOpen.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                fileOpen_actionPerformed(e);
            }
        });
        menuFileSave.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                fileSave_actionPerformed(e);
            }
        });
        menuFileExit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                fileExit_actionPerformed(e);
            }
        });
        menuFileCut.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                fileCut_actionPerformed(e);
            }
        });
        menuFilePaste.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                filePaste_actionPerformed(e);
            }
        });
        font.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                fileColor_actionPerformed(e);
            }
        });
        fileArea.getDocument().addDocumentListener(new DocumentListener() {
            public void insertUpdate(DocumentEvent e) {
                wasChange = isChange;
                isChange = true;
            }

            public void removeUpdate(DocumentEvent e) {
                wasChange = isChange;
                isChange = true;
            }

            public void changedUpdate(DocumentEvent e) {
                wasChange = isChange;
                isChange = true;
            }
        });
        setSize(500, 450);//设置窗体大小
        menuBar.add(menuFile);
        menuFile.setMnemonic('F');
        menuBar.add(menuEdit);
        menuEdit.setMnemonic('E');
        menuFile.add(menuFileOpen);
        menuFileOpen.setMnemonic('O'); //访问健;
        menuFileOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,
                InputEvent.CTRL_MASK)); //快捷健;
        menuFile.add(menuFileSave);
        menuFileSave.setMnemonic('S');//设置当前模型上的键盘助记符，不过现在setMnemonic(char mnemonic)方法已废弃,应使用setMnemonic(int mnemonic) 
        menuFileSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
                InputEvent.CTRL_MASK));
        menuFile.addSeparator();
        menuFile.add(menuFileExit);
        menuFileExit.setMnemonic('E');
        menuEdit.add(menuFileCut);
        menuFileCut.setMnemonic('C');
        menuFileCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
                InputEvent.CTRL_MASK));
        menuEdit.add(menuFilePaste);
        menuFilePaste.setMnemonic('P');
        menuFilePaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P,
                InputEvent.CTRL_MASK));
        menuEdit.add(font);
        font.setMnemonic('N');
        font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,
                InputEvent.CTRL_MASK));
        this.getContentPane().add(new JScrollPane(fileArea));
        setJMenuBar(menuBar);
        fileArea.setLineWrap(true);
    }

    public void fileExit_actionPerformed(ActionEvent e) {//“fileExit”选项监听器
        System.exit(0);//执行退出操作
    }

    public void fileOpen_actionPerformed(ActionEvent e) {//“fileOpen”选项监听器
//以下是filter;
        JFileChooser fileChooser = new JFileChooser();//目录文件选择器
//fileChooser.addChoosableFileFilter(new   myFilter("*.txt","Files(*.txt)"));
        fileChooser.addChoosableFileFilter(fileChooser.getFileFilter());
        if (fileChooser.APPROVE_OPTION != fileChooser.showOpenDialog(this))//“fileChooser.APPROVE_OPTION”:选择确认（yes、ok）后返回该值。
            return;
//以下是文件读
        BufferedReader dataIn = null;//“BufferedReader”：从字符输入流中读取文本
        try {
            dataIn = new BufferedReader(new FileReader(fileChooser.
                    getSelectedFile().getPath()));
            String c = null;
            do {
                c = dataIn.readLine();//读取一个文本行
                if (c != null)
                    fileArea.append(c + "\n");//将给定文本追加到文档结尾,此处为“换行”
            } while (c != null);
        } catch (Exception ex) {
            System.out.println("Catch   exception:" + ex.toString());
        }
    }

    public void exit() {
        if (isChange == false)
            System.exit(1);
        else {
            int decision = JOptionPane.showConfirmDialog(this,//退出时如果未执行保存操作则提示
                    "The   File   has   Change.\n" +
                    "Do   you   want   to   save   the   change?",
                        "Notepad", JOptionPane.YES_NO_CANCEL_OPTION,
                        JOptionPane.WARNING_MESSAGE);//拥有“是”“否”“撤销”类型的提示框
            if (decision == JOptionPane.YES_OPTION) {//选择“是”的情况
//以下是将文件写入计算机!
                try {
                    JFileChooser fileSave = new JFileChooser();
                    fileSave.setDialogTitle("保存文件");
//fileSave.addChoosableFileFilter(new   myFilter("*.txt","Files(*.txt)"));
                    fileSave.addChoosableFileFilter(fileSave.getFileFilter());
                    if (fileSave.APPROVE_OPTION != fileSave.showSaveDialog(this))
                        return;
                    BufferedWriter dataOut = new BufferedWriter(new
                            BufferedWriter(new
                                           FileWriter(fileSave.getSelectedFile())));//“BufferedWriter”：将文本写入字符输出流
                    String c = null;
                    do {
                        String str = fileArea.getText();
                        dataOut.write(str);
                        dataOut.close();
                    } while (c != null);
                } catch (Exception e2) {
                    System.out.println("Catch   exception:有错误!" + e2.toString());
                }
            } else if (decision == JOptionPane.NO_OPTION)//选择“否”的情况
                System.exit(1);
            else if (decision == JOptionPane.CANCEL_OPTION)//选择“取消”的情况
                ;
                ;
        }
//innerclass.fileSave_actionPerformed();
    }

    /***********************/
}

[yiyi_wx]

 public void fileSave_actionPerformed(ActionEvent e1) {

//以下是将文件写入计算机!
        try {
            JFileChooser fileSave = new JFileChooser();
            fileSave.setDialogTitle("保存文件");
//fileSave.addChoosableFileFilter(new   myFilter("*.txt","Files(*.txt)"));
            fileSave.addChoosableFileFilter(fileSave.getFileFilter());
            if (fileSave.APPROVE_OPTION != fileSave.showSaveDialog(this))
                return;
            BufferedWriter dataOut = new BufferedWriter(new BufferedWriter(new
                    FileWriter(fileSave.getSelectedFile() + ".txt")));
//RandomAccessFile   dataOut=new   RandomAccessFile(fileSave.getSelectedFile(),"rw");
            String c = null;
            do {
                String str = fileArea.getText();
                dataOut.write(str);
                dataOut.close();
            } while (c != null);
        } catch (Exception e2) {
            System.out.println("Catch   exception:有错误!" + e2.toString());
        }
    }

    public static void main(String arg[]) {
        Note nt = new Note();
        nt.show();
    }

    public void fileCut_actionPerformed(ActionEvent e) {
        fileArea.cut();
    }

    public void filePaste_actionPerformed(ActionEvent e) {
        fileArea.paste();
    }

    public void fileColor_actionPerformed(ActionEvent e) {
        JColorChooser fileColor = new JColorChooser();
//fileArea.setForeground(fileColor.showDialog(this,"颜色",Color.red));
//fileArea.setSelectionColor(fileColor.showDialog(this,"颜色",Color.red));
        fileArea.setSelectionColor(fileColor.showDialog(this, "颜色", Color.black));
    }

[yiyi_wx]

一个回复放不下，我就分两个贴子了，第二个贴放在前贴末尾
/************/处
不知LZ可否满意

[hanfengthinker]

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