📄 callbackservant.java
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package whiteboard;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
public class CallBackServant extends UnicastRemoteObject implements CallBack
{
WhiteboardFrame frame;
public CallBackServant(WhiteboardFrame f) throws RemoteException
{
frame=f;
}
public void callback(boolean udate) throws RemoteException
{
frame.whiteboardupdate();
if(udate)
frame.update(frame.getGraphics());
}
}
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