readapplettest.java

Java程序设计技巧与开发实例附书源代码。

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class ReadAppletTest extends Applet implements ActionListener
{  private Button read = new Button("Read");
   private Label display = new Label("Java by Definition");
   public void init()
   {  setLayout(new FlowLayout());
      add(read); read.addActionListener(this);
      add(display);
   }
   public void readFile()
   {  try
      { BufferedReader in = new BufferedReader(new FileReader("st.dat"));
        display.setText(in.readLine());
        in.close();
      }
      catch(IOException ioe)
      {  System.out.println(ioe); }
   }
   public void actionPerformed(ActionEvent ae)
   {  if (ae.getSource() == read)
         readFile();
   }
}