窗口现实文件目录程序代码

import java.awt.*;import java.awt.event.*;import java.io.*;class MyWindow{private Frame f;private TextField tf;private Button but,okBut;private TextArea ta;private Label lab;private Dialog dia;private MyDialog mydia;MyWindow(){init();}public  void init(){f = new Frame("my window");f.setBounds(300,200,600,500);f.setLayout(new FlowLayout());tf = new TextField(60);//可以传入字符个数。but = new Button("转  到");ta = new TextArea(25,70);//可传入行和列。dia = new Dialog(f,"错误信息",false);dia.setBounds(400,300,280,200);dia.setLayout(new FlowLayout());lab = new Label();okBut = new Button("确  定");dia.add(lab);dia.add(okBut);f.add(tf);f.add(but);f.add(ta);myEvent();f.setVisible(true);}private void myEvent(){okBut.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){dia.setVisible(false);}});dia.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){dia.setVisible(false);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){if(e.getKeyCode()==KeyEvent.VK_ENTER){showDir();}}});but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){showDir();}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public void showDir(){String path = tf.getText();File dir = new File(path);ta.setText("");if(dir.exists() && dir.isDirectory()){String[] names = dir.list();for(String name : names){ta.append(name+"\r\n");}}else{//dia.setVisible(true);String info = "输入的路径"+path+"是错误的。";//lab.setText(info);//mydia = new MyDialog(f,"路径错误",true,info);MyDialog.getMyDialog(f,"路径错---误",true,info);}}}class MyDialog{private String message;private Dialog d;private Button but;private Label lab;private MyDialog md = new MyDialog(null,null,false,null);private MyDialog(Frame f,String title,boolean mode,String message){d = new Dialog(f,title,mode);d.setBounds(400,300,280,200);d.setLayout(new FlowLayout());but = new Button("自定义确定");lab = new Label(message);d.add(lab);d.add(but);myEvent();d.setVisible(true);}public static MyDialog getMyDialog(){return md;}public void setTitle(String message){this.mesage =message;}private void myEvent(){but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){d.setVisible(false);}}}}

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