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Copying a file using channels and buffers

import java.io.FileInputStream; import java.io.FileOutputStream; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; public class MainClass {   private static final int BSIZE = 1024;   public static void main(String[] args) throws Exception {     FileChannel in = new FileInputStream("source.txt").getChannel(), out = new FileOutputStream(         "target.txt").getChannel();     ByteBuffer buffer = ByteBuffer.allocate(BSIZE);     while (in.read(buffer) != -1) {       buffer.flip();       out.write(buffer);       buffer.clear();     }   } }