23일차

package Week03.day0725;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Objects;

public class practice0725 {

	public static void main(String[] args) throws ParseException {
		
		SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
		
		Product p1 = new Product(3424, "갤럭시S10");
		Product p2 = new Product(3331, "아이폰XR");
		Product p3 = new Product(5552, "아이폰X");
		Product p4 = new Product(1111, "아이폰S7");
		
		HashMap products = new HashMap();
		
//		products.put(004, "갤럭시S10");
//		products.put(001, "아이폰XR");
//		products.put(002, "아이폰X");
//		products.put(003, "아이폰S7");
		
		Order or = new Order(123, f.parse("2019-07-01"), products);
		
		or.addProduct(1, p1);
		or.addProduct(2, p2);
		or.addProduct(3, p3);
		or.addProduct(4, p4);
		
		or.delProduct(123);
		
		Product pr = new Product(9997, "아이패드");
		
		or.chgProduct(1, pr);
		
		or.printKeyBySort(products);
		
		Compare1 c = new Compare1();
		
		or.printValueBySort(c);
		
		
		//comparable로 구현
//		System.out.println("====printValueBySort(by comparable)====");
//		ArrayList<Product> list = new ArrayList<Product>();
//	    list.addAll(products.values());
//		Collections.sort(list);
//	    for(Product p : list) {
//	    	System.out.println(p.toString());
//	    }

	}
}

class Order{
	private int orderNo;
	private Date orderDt;
	private HashMap products = new HashMap(); // 주문상품
	
	public int getOrderNo() {
		return orderNo;
	}

	public void setOrderNo(int orderNo) {
		this.orderNo = orderNo;
	}

	public Order(int orderNo, Date orderDt, HashMap products) {
		this.orderNo = orderNo;
		this.orderDt = orderDt;
		this.products = products;
	}

	public void addProduct(int ordProdNo, Product p) { // 주문상품을 추가한다
		this.orderNo = orderNo;
		this.products.put(ordProdNo, p);
	}
	
	public void delProduct(int ordProdNo) { // 주문상품을 삭제한다
		products.remove(ordProdNo);
	}
	
	public void chgProduct(int orProdNo, Product p) { //  주문상품을 변경한다
		products.replace(orProdNo, p);
	}

	public void printKeyBySort(HashMap products) { // 주문상품을 키를 기준으로 정렬하여 출력한다
		
		System.out.println("====printKeyBySort====");
		HashMap<Integer, Product> hs = new HashMap<Integer, Product>(products);
		Iterator<Integer> it = products.keySet().iterator();   //키값 오름차순 정렬(기본)
		while(it.hasNext()) {
		  Integer key = it.next();
		  System.out.println("key 값 : " + (key) +", 제품명 : " + hs.get(key).getProductNm() + ", 제품번호 : " + hs.get(key).getProductNo());
		 }
	}
	
	public void printValueBySort(Comparator <Product> c) {
		//주문상품을 Value를 기준으로 정렬하여 출력한다                             
		//Value는 제품번호를 기준으로 정렬한다
		
		System.out.println("====printValueBySort====");
		ArrayList<Product> list = new ArrayList<Product>();
	    list.addAll(this.products.values()); // 값을 리턴. comparable로 (내부)
	    Collections.sort(list, c);
	    for(Product p : list) {
	    	System.out.println(p.toString());
	    }
	}
}

class Compare1 implements Comparator<Product> {
	@Override
	public int compare(Product o1, Product o2) {
		if(o1.getProductNo() > o2.getProductNo()){
			return 1;
		} else if (o1.getProductNo() < o2.getProductNo()) {
			return -1;
		} else {
			return 0;
		}
    }
}
	    
	    // Comparator - 편법 키값을 정렬해서 다시 value를 정렬하는 방법.
//	    list.addAll(products.keySet()); // 키값을 리턴. comparator로 (외부)
//	    Collections.sort(list, new Comparator() { 
//	    	@Override
//            public int compare(Object o1,Object o2) {
//                Object v1 = products.get(o1);
//                Object v2 = products.get(o2);
//                return ((Comparable<Object>) v2).compareTo(v1);
//            }
//        });
//	    
//	    Collections.reverse(list); // 주석시 오름차순
//        return;

class Product{
	private int productNo; // 제품번호
	private String productNm; // 제품이름
	
	public Product(int productNo, String productNm) {
		this.productNo = productNo;
		this.productNm = productNm;
	}

	public int getProductNo() {
		return productNo;
	}

	public void setProductNo(int productNo) {
		this.productNo = productNo;
	}

	public String getProductNm() {
		return productNm;
	}

	public void setProductNm(String productNm) {
		this.productNm = productNm;
	}
	
	public int hashCode() {
		return Objects.hash(this.productNm, this.productNo);
	}
	
	public boolean equals(Object obj) {
		if(obj instanceof Product) {
			Product tmp = (Product)obj;
			return this.productNo== tmp.productNo && this.productNm.equals(tmp.productNm);
		}
		return false;
	}
	
	public String toString() {
		return "제품번호 : " + this.getProductNo() + "/" + "제품이름 : " + this.getProductNm();
	}
	
	//comparable로 구현 (Product클래스에 implements Comparable 붙어야함)
//	public int compareTo(Object s) {
//		if(this.productNo < ((Product)s).getProductNo()) {
//			return -1;
//		} else if (this.productNo > ((Product)s).getProductNo()) {
//			return 1;
//		}
//		return 0;
//	}
}