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程序代码:
public interface Goods { public String getName(); public double getPrice(); } public class EatFood implements Goods{ private String name; private double price; public EatFood() { } public EatFood(String name, double price) { super(); this.name = name; this.price = price; } public double getPrice() { return this.price; } public void setPrice(double price) { this.price = price; } public void setName(String name) { this.name = name; } public String getName() { return this.name; } } public class WashGoods implements Goods{ private String name; private double price; public WashGoods() { } public WashGoods(String name, double price) { super(); this.name = name; this.price = price; } public double getPrice() { return this.price; } public void setPrice(double price) { this.price = price; } public void setName(String name) { this.name = name; } public String getName() { return this.name; } } public class ShopCar { private Goods goods[]=null; private int foot; //数组的大小由程序外部决定 public ShopCar(int len) { if(len>0){ goods=new Goods[len]; }else{ goods=new Goods[1]; } } //判断数组的内容是否已满,未满,则添加 public boolean add(Goods g){ if(this.foot<this.goods.length){ this.goods[foot]=g; foot++; return true; }else{ return false; } } //关键字查找 public Goods[] search(String keyword){ Goods go[]=null; int count=0; for(int i=0;i<this.goods.length;i++){ if(goods[i]!=null){ if(this.goods[i].getName().indexOf(keyword)!=-1){ count++; } } } go=new Goods[count]; int f=0; for(int i=0;i<this.goods.length;i++){ if(goods[i]!=null){ if(this.goods[i].getName().indexOf(keyword)!=-1){ go[f]=this.goods[i]; f++; } } } return go; } //得到全部信息 public Goods[] getGoods(){ return this.goods; } } public class JavaSix { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ShopCar s1=new ShopCar(5); s1.add(new EatFood("面包",12.1)); s1.add(new EatFood("辣条",2.4)); s1.add(new EatFood("饼干",22.3)); s1.add(new WashGoods("洗发水",32.5)); s1.add(new WashGoods("卫生纸",22.8)); print(s1.search("饼干")); System.out.println("============="); print(s1.getGoods()); } public static void print(Goods gs[]){ double sum=0; for(int i=0;i<gs.length;i++){ if(gs[i]!=null){ //System.out.println(p[i]+","); System.out.println(gs[i].getName()+","+gs[i].getPrice()); sum=sum+gs[i].getPrice(); } } System.out.println("总价格为:"+sum); } }
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原文地址:http://www.cnblogs.com/simayige/p/5444487.html