java编写文本编辑器

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1、importjava.awt.BorderLayout;importjava.awt.Dialog;importjava.awt.FileDialog;importjava.awt.Frame;importjava.awt.GridLayout;importjava.awt.Label;importjava.awt.Menu;importjava.awt.MenuBar;importjava.awt.MenuItem;importjava.awt.MenuShortcut;importjava.awt.Panel;importjava.awt.Tex

2、tArea;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.KeyEvent;importjava.awt.event.WindowAdapter;importjava.awt.event.WindowEvent;importjava.io.File;importjava.io.FileNotFoundException;importjava.io.FileReader;importjava.io.FileWriter;

3、importjava.io.IOException;importjava.io.PrintWriter;importjava.io.BufferedReader;importjava.io.BufferedWriter;publicclassTextEditorextendsWindowAdapterimplementsActionListener{privateFrameframe;privateTextAreatextarea;privateStringfilename;publicvoidcreateEditor(){//建立文件菜单MenuB

4、armenubar=newMenuBar();Menumenufile=newMenu("文件");MenuItemmenunew=newMenuItem("新建",newMenuShortcut(KeyEvent.VK_N));menufile.add(menunew);MenuItemmenuopen=newMenuItem("打开",newMenuShortcut(KeyEvent.VK_O));menufile.add(menuopen);MenuItemmenusave=newMenuItem("保存",newMenuShortcut(Ke

5、yEvent.VK_S));menufile.add(menusave);menufile.add("另存为……");menufile.addSeparator();menufile.add("退出");menufile.addActionListener(this);menubar.add(menufile);//建立帮助菜单Menumenuhelp=newMenu("帮助");menuhelp.add("关于");menuhelp.addActionListener(this);menubar.setHelpMenu(menuhelp);//主窗

6、口frame=newFrame("Java文本编辑器");frame.setMenuBar(menubar);textarea=newTextArea();frame.add("Center",textarea);frame.addWindowListener(this);frame.setSize(600,400);frame.setVisible(true);}publicvoidactionPerformed(ActionEvente){try{if(e.getActionCommand()=="新建"){textarea.setText(""

7、);}elseif(e.getActionCommand()=="打开"){FileDialogtefdopen=newFileDialog(frame,"Open",0);tefdopen.setVisible(true);filename=tefdopen.getDirectory()+tefdopen.getFile();//读取文件FileReaderfr=newFileReader(filename);BufferedReaderbr=newBufferedReader(fr);Stringstr="";while(br.ready()){

8、intc=br.read();str+=(char)c;}textarea.setText(str);br.