fileoutputcemo.java

简单的java入门编程

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;

class FileOutputCemo extends JFrame 
implements ActionListener {
	
	private JTextArea textArea;
	private JButton saveButton;
	private JTextField nameField;
	private JLabel nameLabel;
	private PrintWriter outFile;
	
	public static void main(String[] args){
		FileOutputCemo frame=new FileOutputCemo();
		frame.setSize(400,300);
		frame.createGUI();
		frame.show();
		
	}
	
	private void createGUI(){
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		Container window=getContentPane();
		window.setLayout(new FlowLayout());
		
		nameLabel=new JLabel("File name:");
		window.add(nameLabel);
		
		nameField=new JTextField(20);
		window.add(nameField);
		
		textArea=new JTextArea(10,30);
		JScrollPane scorllPane=new JScrollPane (textArea);
		window.add(scorllPane);
		
		saveButton=new JButton("save");
		window.add(saveButton);
		saveButton.addActionListener(this);
		
		}
		public void actionPerformed(ActionEvent event){
			if(event.getSource()==saveButton){
				try{
					outFile=new PrintWriter(
						new FileWriter (nameField.getText()),true);
						outFile.print(textArea.getText());
						outFile.close();
				}
				catch (IOException e){
					JOptionPane.showMessageDialog(null,
					"File Error:"+ e.toString());
				}
			}
		}
}