Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using Files.append() API.
package com.bethecoder.tutorials.guava.io_tests; import java.io.File; import java.io.IOException; import com.google.common.base.Charsets; import com.google.common.io.Files; public class FileAppendTest { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { File file = new File("C:\\abcd.txt"); Files.append("\nBE THE CODER", file, Charsets.UTF_8); } }