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import java.io.*;
import java.nio.channels.*;
class filelock{
filelock()throws IOException,InterruptedException{
FileOutputStream fous=null;
FileLock fileLock=null;
try{
fous=new FileOutputStream("f:\\aa.txt");
fileLock=fous.getChannel().tryLock();
Thread.sleep(20*1000);
}catch(IOException e){
e.printStackTrace();
}finally{
if(fileLock!=null)fileLock.release();
if(fous!=null)fous.close();
}
}
public static void main(String[] argv)throws IOException,InterruptedException{
new filelock(); }
}
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