java编程例子源码(狐狸与兔子)
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-------------------------------------------- animal package 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.length>0 && Math.random() < 0.02 ) { ret =
freeAdj[(int)(Math.random()*freeAdj.length)];
}
return ret;
}
@Override
public String toString() {
return ""+age+":"+(isAlive?"live":"dead");
}
public Animal feed(ArrayList
}
protected void longerLife(int inc) {
ageLimit += inc;
}
}
----------------------------------------------- Cell
package cell;
import java.awt.Graphics;
public interface Cell {
void draw(Graphics g, int x, int y, int size);
}
----------------------------------------------- Location package 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; }
}
----------------------------------------------- Fox
package 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);
}
@Override
public 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);
}
@Override
public Animal breed() {
Animal ret = null;
if ( isBreedable() && Math.random() < 0.05 ) {
ret = new Fox();
}
return ret;
}
@Override
public String toString() {
return "Fox:"+super.toString();
}
@Override
public Animal feed(ArrayList
if ( Math.random()< 0.2 ) {
ret =
neighbour.get((int)(Math.random()*neighbour.size()));
longerLife(2);
}
return ret;
}
}
---------------------------------------------- Rabbit package animal;
import java.awt.Color;
import java.awt.Graphics;
import cell.Cell;
public class Rabbit extends Animal implements Cell { public Rabbit() {
super(10,2);
}
@Override
public 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);
}
@Override
public Animal breed() {
Animal ret = null;
if ( isBreedable() && Math.random() < 0.12 ) {
ret = new Rabbit();
}
return ret;
}
@Override
public String toString() {
return "Rabbit:"+super.toString();
}
}