java继承的练习

迷南。 2023-07-25 08:50 12阅读 0赞

package cosmetic;
    
    public class Test {
        
    	public static void main(String[] args) {
        
    		ImportCosmeticManager cm = new ImportCosmeticManager();
    		cm.add(new Cosmetic("香奈儿","进口",1000));
    		cm.add(new Cosmetic("圣罗兰","进口",800));
    		cm.add(new Cosmetic("大宝","国产",20));
    		cm.add(new Cosmetic("万紫千红","国产",15));
    		
    		cm.printInfo();
    	}
    }
    //只输出进口化妆品
    class ImportCosmeticManager extends CosmeticManager{
        
    	public void printInfo() {
        
    		//字符串是否相等用 == 表示地址是否相同  equals表示值是否相等
    		for(int i=0; i<count; i++) {
        
    			if("进口".equals(cs[i].getType())) {
        
    				System.out.println(cs[i].getInfo());
    			}
    		}
    	}
    }
    
    //可按单价排序的化妆品管理类
    class SortCosmeticManager extends CosmeticManager{
        
    	//排序输出所有产品
    	public void printInfo() {
        
    		Cosmetic[] temp = java.util.Arrays.copyOf(cs, count);
    		Cosmetic c = null;
    		for(int i=0; i<temp.length-1; i++) {
        
    			for(int j=0; j<temp.length-i-1; j++) {
        
    				if(temp[j].getPrice() > temp[j+1].getPrice()) {
        
    					c = temp[j];
    					temp[j] = temp[j+1];
    					temp[j+1] = c;
    				}
    			}
    		}
    		for(Cosmetic cosmetic: temp) {
        
    			System.out.println(cosmetic.getInfo());
    		}
    	}
    }
    
    //化妆品管理类
    class CosmeticManager{
        
    	protected Cosmetic[] cs = new Cosmetic[4];
    	protected int count = 0;
    	
    	//进货功能
    	public void add(Cosmetic c) {
        
    		int size = cs.length;
    		while(count >= size) {
        
    			int newLen = size*2;
    			cs = java.util.Arrays.copyOf(cs, newLen);
    		}
    		cs[count] = c;
    		count++;
    	}
    	
    	//输出所有产品
    	public void printInfo() {
        
    		for(int i=0; i<count; i++) {
        
    			System.out.println(cs[i].getInfo());
    		}
    	}
    }
    
    //化妆品类
    class Cosmetic{
        
    	private String name;  //品牌
    	private String type;  //进口或国产
    	private int price;  //单价
    	public Cosmetic() {
        };
    	public Cosmetic(String name, String type, int price) {
        
    		this.name = name;
    		this.type = type;
    		this.price = price;
    	}
    	
    	public void setName(String name) {
        
    		this.name = name;
    	}
    	public String getName() {
        
    		return name;
    	}
    	public void setType(String type) {
        
    		this.type = type;
    	}
    	public String getType() {
        
    		return type;
    	}
    	public void setPrice(int price) {
        
    		this.price = price;
    	}
    	public int getPrice() {
        
    		return price;
    	}
    	public String getInfo() {
        
    		return "name="+name+",type="+type+",price="+price;
    	}
    }