2014.10.28五子棋（一）与多态

五子棋（一）与多态"/>

2014.10.28五子棋（一）与多态

1. 五子棋

   package com.lovo;import java.awt.BasicStroke;
   import java.awt.Color;
   import java.awt.Graphics;
   import java.awt.Graphics2D;
   import java.awt.Stroke;public class Board {private int[][] b = new int[15][15];private boolean blackTurn = true;			// 是否轮到黑方走棋/*** 绘制棋盘* @param g 画笔*/public void draw(Graphics g) {g.setColor(Color.BLACK);Graphics2D g2d = (Graphics2D) g;Stroke oldStroke = g2d.getStroke();		// 记录画笔原来的粗细(保存现场)g2d.setStroke(new BasicStroke(5));		// 修改画笔的粗细g.drawRect(50, 50, 700, 700);			// 绘制棋盘边框g2d.setStroke(oldStroke);			// 将画笔还原为原来的粗细(恢复现场)// 绘制横纵线条for (int i = 0; i < 13; i++) {g.drawLine(50, 100 + 50 * i, 750, 100 + 50 * i);g.drawLine(100 + 50 * i, 50, 100 + 50 * i, 750);}g.fillOval(395, 395, 10, 10);			// 绘制天元// 绘制四个星g.fillOval(195, 195, 10, 10);g.fillOval(595, 595, 10, 10);g.fillOval(195, 595, 10, 10);g.fillOval(595, 195, 10, 10);// 画棋子for(int i = 0; i < b.length; i++) {		// 行控制纵坐标for(int j = 0; j < b[i].length; j++) {	// 列控制横坐标if(b[i][j] != 0) {g.setColor(b[i][j] == 1? Color.BLACK : Color.WHITE);g.fillOval(25 + 50 * j, 25 + 50 * i, 50, 50);}}}}/*** 随机下棋*/public void makeAMove() {int row = (int) (Math.random() * 15);int col = (int) (Math.random() * 15);if(b[row][col] == 0) {b[row][col] = blackTurn ? 1 : 2;	// 用数字1表示黑棋用; 数字2表示白棋blackTurn = !blackTurn;			// 交换走棋方}}}
   

   package com.lovo;public class GameRunner {public static void main(String[] args) {new MyFrame().setVisible(true);}
   }
   

   package com.lovo;import java.awt.Color;
   import java.awt.Graphics;
   import java.awt.Image;
   import java.awt.event.ActionEvent;
   import java.awt.event.ActionListener;
   import java.awt.image.BufferedImage;import javax.swing.JFrame;
   import javax.swing.Timer;@SuppressWarnings("serial")
   public class MyFrame extends JFrame {private Board board = new Board();					// 创建棋盘类的对象private Image offImage = new BufferedImage(800, 800, BufferedImage.TYPE_INT_RGB);public MyFrame() {this.setTitle("五子棋");					// 设置窗口标题this.setSize(800, 800);						// 设置窗口宽度和高度this.setResizable(false);					// 设置窗口大小不可改变this.setLocationRelativeTo(null);				// 设置窗口居中this.getContentPane().setBackground(new Color(150, 100, 50));	// 设置窗口背景色this.setDefaultCloseOperation(EXIT_ON_CLOSE);	// 关闭窗口时结束应用程序Timer timer = new Timer(1000, new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {board.makeAMove();repaint();	// 通知操作系统通知你的窗口调用paint方法重新绘制界面}});timer.start();}@Overridepublic void paint(Graphics g) {	// 重写此方法的目的是在窗口上绘制自己想要的东西Graphics newG = offImage.getGraphics();super.paint(newG);board.draw(newG);g.drawImage(offImage, 0, 0, 800, 800, null);}}
   

   
   
   
   
2. 多态

   package com.lovo;import java.awt.Color;
   import java.awt.Graphics;// 如果一个类有抽象方法，这个类必须被声明为抽象类
   // 抽象类不能实例化（不能创建对象），抽象类是专门用来被继承的
   public abstract class Shape {protected int x, y;protected Color color;/*** 计算周长* @return 图形的周长*/public abstract double getCircumference();	// 抽象方法没有实现/*** 计算面积* @return 图形的面积*/public abstract double getArea();/*** 绘图* @param g 画笔*/public abstract void draw(Graphics g);public int getX() {return x;}public void setX(int x) {this.x = x;}public int getY() {return y;}public void setY(int y) {this.y = y;}public Color getColor() {return color;}public void setColor(Color color) {this.color = color;}}
   

   
   

   package com.lovo;import java.awt.Graphics;public class Rectangle extends Shape {private int width, height;public Rectangle(int width, int height) {this.width = width;this.height = height;}@Overridepublic double getCircumference() {return 2 * (width + height);}@Overridepublic double getArea() {return width * height;}@Overridepublic void draw(Graphics g) {g.setColor(color);g.drawRect(x, y, width, height);}}
   

   
   

   package com.lovo;import java.awt.Graphics;public class Circle extends Shape {private int radius;public Circle(int radius) {this.radius = radius;}@Overridepublic double getCircumference() {return 2 * Math.PI * radius;}@Overridepublic double getArea() {return Math.PI * radius * radius;}@Overridepublic void draw(Graphics g) {g.setColor(color);g.drawOval(x - radius, y - radius, 2 * radius, 2 * radius);}}
   

   
   

   package com.lovo;import java.awt.Color;
   import java.awt.Graphics;import javax.swing.JFrame;@SuppressWarnings("serial")
   public class MyFrame extends JFrame {private Shape[] shapes = new Shape[5];public MyFrame() {this.setSize(800, 600);this.setResizable(false);this.setLocationRelativeTo(null);this.setDefaultCloseOperation(EXIT_ON_CLOSE);for(int i = 0; i < shapes.length; i++) {int num = (int) (Math.random() * 2);Shape currentShape = null;switch(num) {case 0:int radius = (int) (Math.random() * 50 + 50);currentShape = new Circle(radius);break;case 1:int width = (int) (Math.random() * 300 + 100);int height = (int) (Math.random() * 300 + 100);currentShape = new Rectangle(width, height);break;}int r = (int) (Math.random() * 256);int g = (int) (Math.random() * 256);int b = (int) (Math.random() * 256);currentShape.setColor(new Color(r, g, b));int x = (int) (Math.random() * 350 + 50);int y = (int) (Math.random() * 350 + 50);currentShape.setX(x);currentShape.setY(y);shapes[i] = currentShape;}}@Overridepublic void paint(Graphics g) {super.paint(g);for(Shape sh : shapes) {sh.draw(g);// 同样是Shape类型的引用，调用的是同样的draw方法，但却绘制出了不同的图形// 这就是多态 (polymorphism)}}public static void main(String[] args) {new MyFrame().setVisible(true);}
   }