Java图形界面汉诺塔

一个Java初学者简单的小图形界面应用程序。。

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;


public class Hanoi
{
	public static void main(String args[])
	{
		new MyFrame();
	}
}


class GamePanel extends Panel
{
	Stick[] sticks = new Stick[3];
	Button bt;
	GamePanel(int n)
	{
		setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
		sticks[0] = new Stick(n, Color.black);
		sticks[1] = new Stick(n, Color.red);
		sticks[2] = new Stick(n, Color.green);
		for (int i = n - 1; i >= 0; i--)
		{
			sticks[0].addDish(new Dish(i));
		}
		add(sticks[0]);
		add(Box.createHorizontalStrut(10));
		add(sticks[1]);
		add(Box.createHorizontalStrut(10));
		add(sticks[2]);
		validate();
	}
	public void paint(Graphics g)
	{
		g.drawRect(10, 20, 100, 110);
		sticks[0].repaint();
		sticks[1].repaint();
		sticks[2].repaint();
	}
	public void moveDish(int a, int b)
	{
		Dish dish = sticks[a].moveDish();
		sticks[b].addDish(dish);
		repaint();
	}
}


class MyFrame extends Frame implements ActionListener
{
	GamePanel panel;
	Button pre, next, init;
	TextField input;
	Label label;
	Panel menu;
	int a[][], n = 5, i = 0;
	public MyFrame()
	{
		super("汉诺塔");
		a = new int[(int)Math.pow(2, n)][2];
		panel = new GamePanel(n);
		pre = new Button("preview");
		next = new Button("next");
		init = new Button("初始化");
		label = new Label("盘子个数：");
		input = new TextField("5", 8);
		menu = new Panel();
		pre.addActionListener(this);
		next.addActionListener(this);
		init.addActionListener(this);
		menu.add(label);
		menu.add(input);
		menu.add(pre);
		menu.add(next);
		menu.add(init);


		add(panel, BorderLayout.CENTER);
		add(menu, BorderLayout.SOUTH);


		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
		{
			System.exit(0);
		}
		});


		setBounds(300, 100, 800, 300);
		setVisible(true);
		validate();


		hanoi(n, 0, 1, 2);
		i = 0;


	}
	public void actionPerformed(ActionEvent e)
	{
		if (e.getSource() == init)
		{
			try
			{
				n = Integer.parseInt(input.getText());
			}
			catch (NumberFormatException ee)
			{
				JOptionPane.showMessageDialog(null, "输入错误 ");
				return;
			}
			remove(panel);
			panel = new GamePanel(n);
			add(panel, BorderLayout.CENTER);
			validate();
			a = new int[(int)Math.pow(2, n)][2];
			i = 0;
			hanoi(n, 0, 1, 2);
			i = 0;
		}
		else if (e.getSource() == next)
		{
			if (i >= (int)Math.pow(2, n) - 1)
				return;
			panel.moveDish(a[i][0], a[i][1]);
			i++;
		}
		else
		{
			if (i <= 0)
				return;
			i--;
			panel.moveDish(a[i][1], a[i][0]);
		}
	}
	private void hanoi(int n, int x, int y, int z)
	{
		if (n == 1)
		{
			a[i][0] = x;
			a[i][1] = z;
			i++;
		}
		else
		{
			hanoi(n - 1, x, z, y);
			a[i][0] = x; a[i][1] = z; i++;
			hanoi(n - 1, y, x, z);
		}
	}
}


class Dish
{
	Point location;
	int level;
	Color color;
	Dish(int l)
	{
		level = l;
		Random rand = new Random();
		color = new Color(rand.nextInt(256), rand.nextInt(256), rand.nextInt(256));
	}
	public void setLocation(Point p)
	{
		location = p;
	}
	public void Draw(Graphics g)
	{
		g.fillRect(location.x - (40 + level * 20) / 2, location.y, 40 + level * 20, 10);
	}
}


class Stick extends Canvas
{
	Dish[] dishs;
	int dishNum;
	Color color;
	Stick(int n, Color c)
	{
		dishNum = 0;
		color = c;
		dishs = new Dish[n];
	}
	public void addDish(Dish dish)
	{
		dishs[dishNum] = dish;
		dishNum++;
	}
	public Dish moveDish()
	{
		dishNum--;
		Dish dish = dishs[dishNum];
		dishs[dishNum] = null;
		return dish;
	}
	public void paint(Graphics g)
	{
		g.setColor(color);
		g.fillRect((getSize().width) / 2 - 5, (int)(getSize().height*0.1), 10, (int)(getSize().height*0.8));
		g.fillRect((getSize().width) / 10, (int)(getSize().height*0.8 + 10), (getSize().width) / 5 * 4, (int)(getSize().height*0.09));


		for (int i = 0; i < dishNum; i++)
		{
			g.setColor(dishs[i].color);
			dishs[i].setLocation(new Point((getSize().width) / 2, (int)(getSize().height*0.8 - i * 10)));
			dishs[i].Draw(g);
		}
	}
}

运行结果：