黑马程序员——java高新技术——GUI图形化用户界面

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//菜单栏、菜单的练习ackage mymenu;import java.awt.*;import java.awt.event.*;import java.io.*;class  MyText{private Frame f;private MenuBar mb;private Menu mu1,mu2;private MenuItem mi1,mi2,saveMI,openMI;private TextArea ta;private File fi;private FileDialog fd1,fd2;MyText(){       init();}public void init(){f=new Frame();f.setBounds(200,300,650,600);mb=new MenuBar();mu1=new Menu("文件");        mu2=new Menu("子菜单");mi1=new MenuItem("子条目");mi2=new MenuItem("退出");saveMI=new MenuItem("保存");openMI=new MenuItem("打开");fd1=new FileDialog(f,"保存",FileDialog.SAVE);fd2=new FileDialog(f,"打开",FileDialog.LOAD);mu2.add(mi1);mu1.add(mu2);mu1.add(mi2);mb.add(mu1);mu1.add(openMI);mu1.add(saveMI);f.setMenuBar(mb);ta=new TextArea();f.add(ta);        myEvent();f.setVisible(true);}public void myEvent(){saveMI.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if(fi==null){      fd1.setVisible(true);                  String path=fd1.getDirectory();     String name=fd1.getFile();    if(path==null && name==null)    return ;   fi=new File(path,name);}try{                    fi.createNewFile();BufferedWriter br=new BufferedWriter(new FileWriter(fi));        br.write(ta.getText());br.close();}catch (IOException ee){System.out.println("打开文件异常");}}});openMI.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){fd2.setVisible(true);String path=fd2.getDirectory();String name=fd2.getFile();if(path==null && name==null)return ;ta.setText("");File file=new File(path,name);try{BufferedReader br=new BufferedReader(new FileReader(file));for(String str=br.readLine();str!=null;str=br.readLine()){ta.append(str+"\r\n");}br.close();}catch (IOException ee){System.out.println("打开文件异常");}}});mi2.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.exit(0);}});f.addWindowListener(new WindowAdapter(){public void WindowClosing(WindowEvent e){                System.exit(0);}});}public static void main(String[] args) {new MyText();}}

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