filereadertest.java

java练习程序

import java.applet.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
class FileReaderWindow extends Frame implements ActionListener
{
	TextArea text;
	BufferedReader in;
	Button button;
	FileReader file;
	FileReaderWindow()
	{
		super("流的读取");
		text=new TextArea(10,10);
		text.setBackground(Color.cyan);
		try
		{
			File f=new File("E:\\信息系统开发技术\\", "Testfile.txt");
			file=new FileReader(f);
			in=new BufferedReader(file);
		}
		catch(FileNotFoundException e)
		{}
		catch(IOException e)
		{}
		button =new Button("读取");
		button.addActionListener(this);
		setLayout(new BorderLayout());
		setSize(40, 40);
		setVisible(true);
		add(text,  "Center");add("South", button);
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				setVisible(false);System.exit(0);
			}
		});
	}
	
	public void actionPerformed(ActionEvent e)
	{
		String s;
		if(e.getSource()==button)
		try
		{
			while((s=in.readLine())!=null)
				text.append(s+'\n');
		}
		catch(IOException exp)
		{}
	}
}

public class FileReaderTest
{
	public static void main(String args[])
	{
		FileReaderWindow w=new FileReaderWindow();
		w.pack();
	}
}