JAVA_继承演示04_FoodManagerDeamo.java____补充

/** 实现一个超市的食品管理 1.定义一个食品类（Food） 2.定义一个食品管理类（FoodManager）（1）实现进货功能（2）可以输出所有的食品信息功能 3.使用继承实现一个可以按单价排序输出所有食品的功能 4.使用继承实现一个只输出进口食品的功能 */ import java.util.Arrays;public class FoodManagerDeamo{public static void main(String[] args){/*FoodManager fm = new FoodManager();fm.add(new Food("桃李",10));fm.add(new Food("樱花",8));fm.add(new Food("小熊",12));fm.add(new Food("美卡",15));fm.printInfo();*//*SortFoodManager fm = new SortFoodManager();fm.add(new Food("桃李",10));fm.add(new Food("樱花",8));fm.add(new Food("小熊",12));fm.add(new Food("美卡",15));fm.printInfo();*/ImportFoodManager fm = new ImportFoodManager();fm.add(new Food("桃李",10,"国产"));fm.add(new Food("樱花",8,"进口"));fm.add(new Food("小熊",12,"国产"));fm.add(new Food("美卡",15,"进口"));fm.printInfo();}}//4.使用继承实现一个只输出进口食品的功能//写法1/*class ImportFoodManager extends FoodManager{public void printInfo(){for(int i=0;i<super.count;i++){if(super.foods[i].getType().equals("进口")){System.out.println(foods[i].geInfo());}}}}*///4.使用继承实现一个只输出进口食品的功能//写法2 推荐写法2class ImportFoodManager extends FoodManager{public void printInfo(){String type =null;for(int i=0;i<super.count;i++){type = super.foods[i].getType();if(type.equals("进口")){System.out.println(foods[i].geInfo());}}}}//子类 //3.使用继承实现一个可以按单价排序输出所有食品的功能class SortFoodManager extends FoodManager{//重写父类的打印方法，实现排序功能public void printInfo(){//通过super把foods[]数组赋值给fs[]//Food[] fs = super.foods;Food[] fs = new Food[super.count];for(int i=0;i<fs.length;i++){fs[i] = super.foods[i];}//冒泡排序Food temp = null;for(int i=0;i<fs.length-1;i++){for(int j=0;j<fs.length-1-i;j++){if(fs[j].getPrice()>fs[j+1].getPrice()){temp = fs[j];fs[j] = fs[j+1];fs[j+1] = temp;}}}//for(int i=0;i<count;i++){System.out.println(fs[i].geInfo());}}}//类 食品管理类//2.定义一个食品管理类（FoodManager）class FoodManager{protected Food[] foods = new Food[3];protected int count = 0;//添加食品public void add(Food f){if(count>=foods.length){int newLen = foods.length*3/2+1;//import java.util.Arrays;foods = Arrays.copyOf(foods,newLen);}foods[count] = f;count++;}//输出所有食品public void printInfo(){for(int i=0;i<count;i++){System.out.println(foods[i].geInfo());}}}//类 食品类// 1.定义一个食品类（Food）class Food{private String name;private float price;//4.使用继承实现一个只输出进口食品的功能private String type;//国产或进口public Food(){};public Food(String name,float price,String type){this.name = name;this.price = price;this.type = type;}//namepublic void setName(String name){this.name = name;}public String getName(){return name;}//pricepublic void setPrice(float price){this.price = price;}public float getPrice(){return price;}//typepublic void setType(String type){this.type = type;}public String getType(){return type;}public String geInfo(){return "食品名称："+name+"，价格："+price+"，类型为"+type;}}