file_chooser

package test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;

import javax.swing.JFileChooser;

public class helloworld {

	public static void main(String[] args) throws IOException {
		JFileChooser ch = new JFileChooser();
		/*ch.showOpenDialog(null);
		ch.showSaveDialog(null);*/
		BufferedReader br;
		BufferedWriter bw;
		StringBuffer buffer = new StringBuffer();
		int result = ch.showOpenDialog(null);
		if(result == JFileChooser.APPROVE_OPTION)
		{
			File file = ch.getSelectedFile();
			br = new BufferedReader(new FileReader(file));
			String line;
			while((line = br.readLine())!=null)
			{
				buffer.append(line);
			}
			System.out.println(buffer);
			br.close();
		}
		
		result = ch.showSaveDialog(null);
		if(result == JFileChooser.APPROVE_OPTION)
		{
			File file = ch.getSelectedFile();
			bw = new BufferedWriter(new FileWriter(file));
			bw.write(buffer.toString());
			bw.flush();
			bw.close();
		}
		
		
	}

}