cardpile.java

一些JAVA的小程序

//
//	Abstraction for piles of cards for Solitaire game
//	written by Tim Budd, April 1997
//

import java.awt.*;
import java.util.Stack;
import java.util.EmptyStackException;

public class CardPile {
		// coordinates of the card pile
	protected int x;
	protected int y;
	protected Stack thePile;

		// constructor
	CardPile (int xl, int yl) 
		{ x = xl; y = yl; thePile = new Stack(); }

		// access to cards are not overridden
	public final Card top() { return (Card) thePile.peek(); }

	public final boolean isEmpty() { return thePile.empty(); }

	public final Card pop() {
		try {
			return (Card) thePile.pop();
			} catch (EmptyStackException e) { return null; }
		}

		// the following are sometimes overridden
	public boolean includes (int tx, int ty) {
		return x <= tx && tx <= x + Card.width &&
			y <= ty && ty <= y + Card.height;
		}
	
	public void select (int tx, int ty) {
		// do nothing
		}

	public void addCard (Card aCard)  
		{ thePile.push(aCard); }

	public void display (Graphics g) {
		g.setColor(Color.blue);
		if (isEmpty())
			g.drawRect(x, y, Card.width, Card.height);
		else
			top().draw(g, x, y);
		}

	public boolean canTake (Card aCard) {
		return false; 
		}

}