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				import java.io.FileOutputStream;
				import java.nio.channels.*;
				public class FileLocking {
				  public static void main(String[] args) throws Exception {
				    FileOutputStream fos= new FileOutputStream("file.txt");
				    FileLock fl = fos.getChannel().tryLock();
				    if(fl != null) {
				      System.out.println("Locked File");
				      Thread.sleep(100);
				      fl.release();
				      System.out.println("Released Lock");
				    }
				    fos.close();
				  }
				}