java 实例分析 接口与类的应用

import java.util.Scanner;

interface Pet{
    public int getAge();
    public String getColor();
    public String getName();
}

class Cat implements Pet{
    private String name;
    private String color;
    private int age;
    public Cat(String name,String color,int age){
        this.setName(name);
        this.setColor(color);
        this.setAge(age);
    }
    public int getAge() {
        return age;
    }
    public String getColor() {
        return color;
    }
    public String getName(){
        return this.name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public void setName(String name) {
        this.name = name;
    }

}

class Dog implements Pet{
    private String name;
    private String color;
    private int age;
    public Dog(String name,String color,int age){
        this.setName(name);
        this.setColor(color);
        this.setAge(age);
    }
    public int getAge() {
        return age;
    }
    public String getColor() {
        return color;
    }
    public String getName(){
        return this.name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public void setName(String name) {
        this.name = name;
    }

}
class PetShop{
    private Pet[] pets;
    private int foot;
    public PetShop(int len){
        if(len>0){
            this.pets=new Pet[len];
        }
        else{
            this.pets=new Pet[1];
        }
    }

public boolean add(Pet pet){
    if(this.foot<this.pets.length){
        this.pets[this.foot]=pet;
        this.foot++;
        return true;
    }
    else{
        return false;
    }
        }

public Pet[] search(String keyWord){//关键字查找，返回的是Pet数组
    Pet p[]=null;
    int count=0;
    for(int i=0;i<this.pets.length;i++){
        if(this.pets[i]!=null){
            if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
                count++;
            }
        }
    }
    p=new Pet[count];//开辟对象数组
    int f=0;//设置增加的标记
    for(int i=0;i<this.pets.length;i++){
        if(this.pets[i]!=null){
            if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
                p[f]=this.pets[i];
                f++;
            }
        }
    }
    return p;
}
}
public class PetshopDemo {
    
    public static void main(String args[]){
        PetShop ps=new PetShop(2);
        ps.add(new Cat("whiteCat","white",2));
        ps.add(new Dog("blackDog","black",3));
        print(ps.search("black"));
    }
    public static void print(Pet p[]){
        for(int i=0;i<p.length;i++){
            if(p[i]!=null){
                System.out.println(p[i].getName()+","+p[i].getColor()+","+p[i].getAge());
            }
        }
    }
}

-------------------------------------------------------------------------------------------------------------------------------------------------

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