Java语言中继承和多态。

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package animal.mammal; import java.io.*; /** * * @author Administrator */ public class MainMammal { public static void main(String args[]){ EnumMammal En=null; Integer s=0; String str; char t='n'; Mammal m=new Mammal(); BufferedReader br; InputStreamReader in; outer: while(true){ System.out.println("choic mammal:"); System.out.print("1.Dog "); System.out.print("2.Cat "); System.out.print("3.Horse "); System.out.print("4.Pig "); System.out.print("0.exit "); in=new InputStreamReader(System.in); br=new BufferedReader(in); try{ str=br.readLine(); s=new Integer(str); }catch(IOException e){} switch(s){ case 1: m=new DogMammal(1,2); En=EnumMammal.Dog;break; case 2: m=new CatMammal(1,2); En=EnumMammal.Cat;break; case 3: m=new HorseMammal(1,2); En=EnumMammal.Horse;break; case 4: m=new PigMammal(1,2); En=EnumMammal.Pig;break; case 0: break outer; default: System.out.println("input error!"); continue; } System.out.println("set age:"); in=new InputStreamReader(System.in); br=new BufferedReader(in); try{ str=br.readLine(); s=new Integer(str); }catch(IOException e){} m.setAge(s); System.out.println("set weight:"); in=new InputStreamReader(System.in); br=new BufferedReader(in); try{ str=br.readLine(); s=new Integer(str); }catch(IOException e){} m.setWeight(s); System.out.println("finish?(Y/N)"); in=new InputStreamReader(System.in); br=new BufferedReader(in); try{ t=(char)br.read(); }catch(IOException e){} if(t=='N'||t=='n') continue outer; else{ System.out.println("the animal your chioced is "+En); System.out.println("Varieties:"+m.getVarieties()); System.out.println("Age:"+m.getAge()); System.out.println("Weight:"+m.getWeight()); } while(true){ System.out.println("choice action:"); System.out.print("1.Move "); System.out.print("2.Speak "); System.out.print("3.Sleep "); System.out.print("4.Cry "); System.out.print("5.Wag "); System.out.print("6.Beg "); System.out.print("7.choice other animals "); System.out.print("0.exit "); in=new InputStreamReader(System.in); br=new BufferedReader(in); try{ str=br.readLine(); s=new Integer(str); }catch(IOException e){} switch(s){ case 1:m.move();break; case 2:m.speak();break; case 3:m.sleep();break; case 4:m.Cry();break; case 5:m.Wag();break; case 6:m.Beg();break; case 7:continue outer; case 0:break outer; default:continue; } } } } }