queue.java

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package MyNa.utils;
import java.util.*;

public class Queue extends Vector {

public boolean isEmpty(){return size()<=0;}

public void append(Object ob){addElement(ob);}

public Object next() throws Exception{
  if(isEmpty())throw new Exception("no Queue.next() on empty queue");
  Object ob=firstElement();
  removeElementAt(0);
  return ob;
}
}