mynotepad.java

java的IO类演示

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

public class MyNotepad extends WindowAdapter implements ActionListener
{
	Frame f;
	Button btn;
	TextArea ta;
	String fileName;
	
	public static void main(String argv[])
	{
		new MyNotepad(argv[0]);
	}
	
	public MyNotepad(String fileName)
	{
		this.fileName = fileName;
		f = new Frame(fileName);
		f.addWindowListener(this);
		
		btn = new Button("保存文件");
		btn.addActionListener(this);
		
		ta = new TextArea(10,40);
		
		f.add(ta, BorderLayout.CENTER);
		f.add(btn, BorderLayout.SOUTH);
		
		f.pack();
		f.setVisible(true);
	}
	
	public void actionPerformed(ActionEvent e)
	{
		try {
			FileOutputStream fout = new FileOutputStream(fileName);
			byte buf[] = ta.getText().getBytes();
			fout.write(buf);
			fout.close();
		}
		catch (IOException ioe)
		{
			System.err.println(e);
		}
	}
	
	public void windowClosing(WindowEvent e)
	{
		System.exit(0);
	}
}