java编程例子源码(狐狸与兔子).doc

- animalpackage animal;import java.util.ArrayList;import field.Location;public abstract class Animal private int ageLimit;private int breedableAge;private int age;private boolean isAlive = true;public Animal(int ageLimit, int breedableAge) this.ageLimit = ageLimit;this.breedableAge = breedableAge;protected int getAge() return age;protected double getAgePercent() return (double)age/ageLimit;public abstract Animal breed();public void grow() age+;if ( age = ageLimit ) die();public void die() isAlive = false;public boolean isAlive() return isAlive; public boolean isBreedable() return age = breedableAge;public Location move(Location freeAdj) Location ret = null;if ( freeAdj.length0 & Math.random() 0.02 ) ret = freeAdj(int)(Math.random()*freeAdj.length);return ret;Overridepublic String toString() return +age+:+(isAlive?live:dead);public Animal feed(ArrayList neighbour) return null;protected void longerLife(int inc) ageLimit += inc;- Cellpackage cell;import java.awt.Graphics; public interface Cell void draw(Graphics g, int x, int y, int size);- Locationpackage field;public class Location private int row;private int col;public Location(int row, int col) this.row = row;this.col = col;public int getRow() return row; public int getCol() return col; - Foxpackage animal;import java.awt.Color;import java.awt.Graphics;import java.util.ArrayList;import cell.Cell;public class Fox extends Animal implements Cell public Fox() super(20,4);Overridepublic void draw(Graphics g, int x, int y, int size) int alpha = (int)(1-getAgePercent()*255);g.setColor(new Color(0, 0, 0, alpha);/(int)(20-getAge()/20.0*255);g.fillRect(x, y, size, size);Overridepublic Animal breed() Animal ret = null;if ( isBreedable() & Math.random() 0.05 ) ret = new Fox();return ret;Overridepublic String toString() return Fox:+super.toString();Overridepublic Animal feed(ArrayList neighbour) Animal ret = null;if ( Math.random() 0.2 ) ret = neighbour.get(int)(Math.random()*neighbour.size();longerLife(2);return ret;- Rabbitpackage animal;import java.awt.Color;import java.awt.Graphics;import cell.Cell;public class Rabbit extends Animal implements Cell public Rabbit() super(10,2);Overridepublic void draw(Graphics g, int x, int y, int size) int alpha = (int)(1-getAgePercent()*255);g.setColor(new Color(255, 0, 0, alpha);g.fillRect(x, y, size, size);Overridepublic Animal breed() Animal ret = null;if ( isBreedable() & Math.random() 0.12 ) ret = new Rabbit();return ret;Overridepublic String toString() return Rabbit:+super.toString();- Viewpackage field;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import javax.swing.JPanel;import cell.Cell;public class View extends JPanel private static final long serialVersionUID = -2417015700213488315L;private static final int GRID_SIZE = 16;private Field theField;public View(Field field) theField = field;Overridepublic void paint(Graphics g) super.paint(g);g.setColor(Color.GRAY);for ( int row = 0; rowtheField.getHeight(); row+ ) g.drawLine(0, row*GRID_SIZE, theField.getWidth()*GRID_SIZE, row*GRID_SIZE);for ( int col = 0; coltheField.getWidth(); col+ ) g.drawLine(col*GRID_SIZE, 0, col*GRID_SIZE, theField.getHeight()*GRID_SIZE);for ( int row = 0; rowtheField.getHeight(); row+ ) for ( int col = 0; coltheField.getWidth(); col+ ) Cell cell = theField.get(row, col);if ( cell != null ) cell.draw(g, col*GRID_SIZE, row*GRID_SIZE, GRID_SIZE);Overridepublic Dimension getPreferredSize() return new Dimension(theField.getWidth()*GRID_SIZE+1, theField.getHeight()*GRID_SIZE+1);- Fieldpackage field;import java.util.ArrayList;import cell.Cell;public class Field private static final Location adjacent = new Location(-1,-1),new Location(-1,0),new Location(-1,1),new Location(0,-1), new Location(0,0), new Location(0,1),new Location(1,-1), new Location(1,0), new Location(1,1);private int width;private int height;private Cell field;public Field(int width, int height) this.width = width;this.height = height;field = new Cellheightwidth;public int getWidth() return width; public int getHeight() return height; public Cell place(int row, int col, Cell o) Cell ret = fieldrowcol;fieldrowcol = o;return ret;public Cell get(int row, int col) return fieldrowcol;public Cell getNeighbour(int row, int col) ArrayList list = new ArrayList();for ( int i=-1; i2; i+ ) for ( int j=-1; j-1 & r-1 & cwidth & !(r= row & c = col) ) list.add(fieldrc);return list.toArray(new Celllist.size();public Location getFreeNeighbour(int row, int col) ArrayList list = new ArrayList();for ( Location loc : adjacent ) int r = row+loc.getRow();int c = col+loc.getCol();if ( r -1 & r-1 & c0 ) int idx = (int)(Math.random()*freeAdj.length);fieldfreeAdjidx.getRow()freeAdjidx.getCol() = cell;ret = true;return ret;public Cell remove(int row, int col) Cell ret = fieldrowcol;fieldrowcol = null;return ret;public void remove(Cell cell) for ( int row = 0; row height; row+ ) for ( int col = 0; col width; col+ ) if ( fieldrowcol = cell ) fieldrowcol = null;break;public void clear() for ( int i=0; iheight; i+ ) for ( int j=0; jwidth; j+ ) fieldij = null;public void move(int row, int col, Location loc) fieldloc.getRow()loc.getCol() = fieldrowcol;remove(row, col);- FoxAndRabbitpackage foxnrabbit;import java.util.ArrayList;import javax.swing.JFrame;import animal.Animal;import animal.Fox;import animal.Rabbit;import cell.Cell;import field.Field;import field.Location;import field.View;public class FoxAndRabbit private Field theField;private View theView;public FoxAndRabbit(int size) theField = new Field(size, size);for ( int row = 0; rowtheField.getHeight(); row+ ) for ( int col = 0; coltheField.getWidth(); col+ ) double probability = Math.random();if ( probability 0.05 ) theField.place(row, col, new Fox(); else if ( probability 0.15 ) theField.place(row, col, new Rabbit(); theView = new View(theField);JFrame frame = new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setResizable(false);frame.setTitle(Cells);frame.add(theView);frame.pack();frame.setVisible(true);public void start(int steps) for ( int i=0; isteps; i+ ) step();theView.repaint();try Thread.sleep(200); catch (InterruptedException e) e.printStackTrace();public void step() for ( int row = 0; row theField.getHeight(); row+ ) for ( int col = 0; col theField.getWidth(); col+ ) Cell cell = theField.get(row, col);if ( cell != null ) Animal ani