java编程例子源码（狐狸与兔子）

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packageanimal;

importjava.util.ArrayList;

importfield.Location;

publicabstractclassAnimal{privateintageLimit;privateintbreedableAge;privateintage;privatebooleanisAlive=true;publicAnimal(intageLimit,intbreedableAge){this.ageLimit=ageLimit;this.breedableAge=breedableAge;}protectedintgetAge(){returnage;}protecteddoublegetAgePercent(){return(double)age/ageLimit;}publicabstractAnimalbreed();publicvoidgrow(){age++;if(age>=ageLimit){die();}}publicvoiddie(){isAlive=false;}publicbooleanisAlive(){returnisAlive;}publicbooleanisBreedable(){returnage>=breedableAge;}publicLocationmove(Location[]freeAdj){

Locationret=null;if(freeAdj.length>0}returnret;}@OverridepublicStringtoString(){return\}publicAnimalfeed(ArrayListneighbour){returnnull;}protectedvoidlongerLife(intinc){ageLimit+=inc;}}

Cell

packagecell;

importjava.awt.Graphics;

publicinterfaceCell{voiddraw(Graphicsg,intx,inty,intsize);}

Location

packagefield;

publicclassLocation{privateintrow;privateintcol;publicLocation(introw,intcol){this.row=row;this.col=col;}publicintgetRow(){returnrow;}publicintgetCol(){returncol;}}

Fox

packageanimal;

importjava.awt.Color;importjava.awt.Graphics;importjava.util.ArrayList;

importcell.Cell;

publicclassFoxextendsAnimalimplementsCell{publicFox(){super(20,4);}@Overridepublicvoiddraw(Graphicsg,intx,inty,intsize){intalpha=(int)((1-getAgePercent())*255);g.setColor(newColor(0,0,0,alpha));//(int)((20-getAge())/20.0*255)));g.fillRect(x,y,size,size);}@OverridepublicAnimalbreed(){Animalret=null;if(isBreedable()}returnret;}@OverridepublicStringtoString(){return\}@OverridepublicAnimalfeed(ArrayListneighbour){Animalret=null;if(Math.random()list=newArrayList();for(inti=-1;i-1}}}returnlist.toArray(newCell[list.size()]);}

publicLocation[]getFreeNeighbour(introw,intcol){ArrayListlist=newArrayList();for(Locationloc:adjacent){intr=row+loc.getRow();intc=col+loc.getCol();if(r>-1}}returnlist.toArray(newLocation[list.size()]);}

publicbooleanplaceRandomAdj(introw,intcol,Cellcell){booleanret=false;Location[]freeAdj=getFreeNeighbour(row,col);if(freeAdj.length>0){intidx=(int)(Math.random()*freeAdj.length);field[freeAdj[idx].getRow()][freeAdj[idx].getCol()]=cell;ret=true;}returnret;}

publicCellremove(introw