Mine

import java.io.*;public class Whatever {		/**	 * @param args	 */	public static void main(String[] args) {		File target = new File("test.txt");		String lineToWrite = "a new line";		try {			FileWriter writer = new FileWriter(target, true); // This opens the file in append mode			writer.write(lineToWrite + "\n");			writer.close();		} catch (IOException e) {			//Throw it as a runtimeexception to exit the program			throw new RuntimeException(e);		}	}}