AbstractQueue.java

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package aud.adt;
 
import java.util.NoSuchElementException;
 
public abstract class AbstractQueue<T> {
 
  protected AbstractQueue() {}
 
  public abstract boolean is_empty();
 
  public abstract T front();
 
  public abstract T dequeue();
 
  public abstract void enqueue(T x);
 
  @Override
  public String toString() { return "AbstractQueue"; }
}