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Writer.java

class Writer 
{
     ReadWriteLock rw;
     
     public Writer(ReadWriteLock rw)
     {
          this.rw = rw;
     }
     
     public void write ()
     {
          this.rw.writeLock().acquire();
          java.lang.System.out.println("Start writing...");
          java.lang.System.out.println("Finish writing...");
          this.rw.writeLock().release();
     }
}

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