面向对象高级（二）

文章目录

1. 1. 继承应用

继承应用

实现一个化妆品商城中的化妆品管理

1. 定义一个化妆品类（Cosmetic)
2. 定义一个化妆品管理类（CosmeticManager）
   • 实现进货功能
   • 可以输出所有化妆品信息功能
3. 使用继承实现一个可按单价排序输出所有化妆品的功能
4. 使用继承实现一个只输出进口化妆品的功能

//化妆品管理应用（继承）
import java.util.Arrays;
public class Test2{
	public static void main(String[] args){
		/*
		CosmeticManager cm = new CosmeticManager();
		cm.add("new Cosmetic("香奈儿",800.0f));
		cm.add("new Cosmetic("大宝",10.0f));
		cm.add("new Cosmetic("郁美净",8.0f));
		cm.add("new Cosmetic("玉兰油",100.0f));
		
		
		cm.printInfo();
		*/
		/*
		CosmeticManager cm = new CosmeticManager();
		cm.add("new Cosmetic("香奈儿",800.0f));
		cm.add("new Cosmetic("大宝",10.0f));
		cm.add("new Cosmetic("郁美净",8.0f));
		cm.add("new Cosmetic("玉兰油",100.0f));
		
		cm.printInfo();
		*/
		ImportCosmeticManager cm = new CosmeticManager();
		cm.add("new Cosmetic("香奈儿",800.0f,"进口"));
		cm.add("new Cosmetic("大宝",10.0f,"国产"));
		cm.add("new Cosmetic("郁美净",8.0f,"国产"));
		cm.add("new Cosmetic("玉兰油",100.0f,"进口"));
		
		cm.printInfo();
		
		
	}
}


//只输出进口化妆品
class ImportCosmeticManager extends CosmeticManager{
	public void printInfo(){
		String type = null;
		for(int i=0;i<super.count;i++){
			super.cosmetics[i].getType();
			if("进口".equals(type)){
				System.out.println(cosmetics[i].getInfo());
				
			}
		}
	}
}

//可按单价排序
class SortCosmeticManager extends CosmeticManager{
	//重写了父类的打印方法，实现了排序功能
	public void println(){
		Cosmetic[] cs = new Cosmetic[super.count];
		for(int i=0;i<cs.length;i++){
			cs[i] = super.cosmetics[i];
		}
		Cosmetic temp=null;
		//冒泡排序
		for(int i =0;i<cs.length-1;i++){
			for(int j=0;j<cs.length-1-i;j++){
				if(cs[j].getPrice()>cs[j+1].getPrice()){
					temp = cs[j];
					cs[j] = cs[j+1];
					cs[j+1] = temp;
				}
			}
		}
		for(int i=0;i<count;i++){
			System.out.println()cs[i].getInfo();
		}
		
	}
}

 //化妆品管理类
 class CosmeticManager{
	 private Cosmetic[] cosmetics = new Cosmetic[3];
	 prot  int count = 0;
	 //化妆品进货
	 public void add(Cosmetic c){
		 if(count>=cosmetics.length){
			 int newLen = cosmetics.length*3/2+1;
			cosmetics = Arrays.copyOf(cosmetics,newLen);
		 }
		 cosmetics[count]=c;
		 count++;
	 }
	 //输出所有化妆品
	 public void printInfo(){
		 for(int i=0;i<cosmetics;i++){
			 System.out.println(cosmetics[i].getInfo());
		 }
	 }
 }
 
 //化妆品类
 class Cosmetic{
	 private String name;
	 private float price;
	 private String type; //国产或进口
	 public Cosmetic(){};
	 publi Cosmetic(String name,float price,String type){
		 this.name = name;
		 this.price = price;
		 this.type = type;
	 }
	 public void setName(String name){
		 this.name = name;
	 }
	 public String getName(){
		 return name;
	 }
	 public void setPrice(){
		 this.price;
	 }
	  public void setName(String type){
		 this.type= type;
	 }
	 public String getType(){
		 return Type;
	 }
	 public float getPrice(){
		 return price;
	 }
	 public void getInfo(){
		 return "化妆品名称:"+name+"单价为："+price+"类型为"+type;
	 }
 }