VerboseQueue.java

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package aud.example;
 
import java.util.NoSuchElementException;
import aud.Queue;
 
public class VerboseQueue<T> extends Queue<T> {
 
  int size_ = 0;
 
  public VerboseQueue() {}
 
  @Override public T dequeue() throws NoSuchElementException {
    T x=super.dequeue();
    --size_;
    print("dequeue "+x);
    return x;
  }
 
  @Override public void enqueue(T x) {
    super.enqueue(x);
    print("enqueue "+x);
    ++size_;
  }
 
  private void print(String message) {
    for (int i=0;i<size_;++i)
      System.err.print(" ");
    System.err.println(message+" => "+toString());
  }
 
};