java 实例分析 接口与类的应用

  1 import java.util.Scanner;
  2 
  3 interface Pet{
  4     public int getAge();
  5     public String getColor();
  6     public String getName();
  7 }
  8 
  9 class Cat implements Pet{
 10     private String name;
 11     private String color;
 12     private int age;
 13     public Cat(String name,String color,int age){
 14         this.setName(name);
 15         this.setColor(color);
 16         this.setAge(age);
 17     }
 18     public int getAge() {
 19         return age;
 20     }
 21     public String getColor() {
 22         return color;
 23     }
 24     public String getName(){
 25         return this.name;
 26     }
 27     public void setAge(int age) {
 28         this.age = age;
 29     }
 30     public void setColor(String color) {
 31         this.color = color;
 32     }
 33     public void setName(String name) {
 34         this.name = name;
 35     }
 36 
 37 }
 38 
 39 class Dog implements Pet{
 40     private String name;
 41     private String color;
 42     private int age;
 43     public Dog(String name,String color,int age){
 44         this.setName(name);
 45         this.setColor(color);
 46         this.setAge(age);
 47     }
 48     public int getAge() {
 49         return age;
 50     }
 51     public String getColor() {
 52         return color;
 53     }
 54     public String getName(){
 55         return this.name;
 56     }
 57     public void setAge(int age) {
 58         this.age = age;
 59     }
 60     public void setColor(String color) {
 61         this.color = color;
 62     }
 63     public void setName(String name) {
 64         this.name = name;
 65     }
 66 
 67 }
 68 class PetShop{
 69     private Pet[] pets;
 70     private int foot;
 71     public PetShop(int len){
 72         if(len>0){
 73             this.pets=new Pet[len];
 74         }
 75         else{
 76             this.pets=new Pet[1];
 77         }
 78     }
 79 
 80 public boolean add(Pet pet){
 81     if(this.foot<this.pets.length){
 82         this.pets[this.foot]=pet;
 83         this.foot++;
 84         return true;
 85     }
 86     else{
 87         return false;
 88     }
 89         }
 90 
 91 public Pet[] search(String keyWord){//关键字查找，返回的是Pet数组
 92     Pet p[]=null;
 93     int count=0;
 94     for(int i=0;i<this.pets.length;i++){
 95         if(this.pets[i]!=null){
 96             if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
 97                 count++;
 98             }
 99         }
100     }
101     p=new Pet[count];//开辟对象数组
102     int f=0;//设置增加的标记
103     for(int i=0;i<this.pets.length;i++){
104         if(this.pets[i]!=null){
105             if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
106                 p[f]=this.pets[i];
107                 f++;
108             }
109         }
110     }
111     return p;
112 }
113 }
114 public class PetshopDemo {
115     
116     public static void main(String args[]){
117         PetShop ps=new PetShop(2);
118         ps.add(new Cat("whiteCat","white",2));
119         ps.add(new Dog("blackDog","black",3));
120         print(ps.search("black"));
121     }
122     public static void print(Pet p[]){
123         for(int i=0;i<p.length;i++){
124             if(p[i]!=null){
125                 System.out.println(p[i].getName()+","+p[i].getColor()+","+p[i].getAge());
126             }
127         }
128     }
129 }

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运用pet接口，自定义宠物的数量，应使用数组。运用indexOf统计数量