java自定义排序

package GoodsSorting;
//实例类
public class GoodsParameter {
    // 价格
    private double price;
    // 收藏量
    private int favor;
    // 商品名称
    private String goodsname;
    //无参构造
    public GoodsParameter() {
        super();
    }
    //带参构造
    public GoodsParameter(String goodsname, double price, int favor) {
        super();
        this.price = price;
        this.favor = favor;
        this.goodsname = goodsname;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    public int getFavor() {
        return favor;
    }
    public void setFavor(int favor) {
        this.favor = favor;
    }
    public String getGoodsname() {
        return goodsname;
    }
    public void setGoodsname(String goodsname) {
        this.goodsname = goodsname;
    }
    //重写tostring
    @Override
    public String toString() {
        return "	商品:" + getGoodsname() + "	价格:" + getPrice() + "	收藏量:"
                + getFavor() + "
";
    }
}

package GoodsSorting;
//排序工具类
import java.util.Comparator;

public class PriceSort implements Comparator<GoodsParameter> {

    public int compare(GoodsParameter o1, GoodsParameter o2) {
        int i=0;
        //按价格排序 正序
        if ((o1.getPrice() - o2.getPrice()) > 0) {
            i=1;
        
        }
        else {
            i=-1;
            
        }
        return i;
        
    }

}

package GoodsSorting;

import java.util.Comparator;

public class FavorSort implements Comparator<GoodsParameter> {

    public int compare(GoodsParameter o1, GoodsParameter o2) {
        int i = 0;
        // 按收藏排序 正序
        if (o1.getFavor()-o2.getFavor()<0) {  //逆序只需修改为>0
            i=-1;
        }
        return i;
    }

}

package GoodsSorting;

import java.util.Comparator;

public class NameSort implements Comparator<GoodsParameter> {
    public int compare(GoodsParameter o1, GoodsParameter o2) {
        int result = o1.getGoodsname().compareTo(o2.getGoodsname());
        return result;
    }

}

package GoodsSorting;
//测试类
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class TestApp {
    public static void main(String[] args) {
        List<GoodsParameter> list = new ArrayList<GoodsParameter>();
        list.add(new GoodsParameter("iphone", 5200, 110000));
        list.add(new GoodsParameter("xiaomi", 1999, 50000));
        list.add(new GoodsParameter("huawei", 1899, 60054));
        list.add(new GoodsParameter("samsung", 4500, 80000));
        list.add(new GoodsParameter("meizu", 1699, 125863));
        // 排序前
        System.out.println("原序:**********************");
        System.out.println(list);

        Collections.sort(list, new PriceSort()); // 注意这里是collections
        // 按价格排序后
        System.out.println("价格排序:**********************");
        System.out.println(list);
        // 收藏量正序
        System.out.println("收藏量排序:**********************");
        Collections.sort(list, new FavorSort());
        System.out.println(list);
        // 名称正序
        System.out.println("名称排序:**********************");
        Collections.sort(list, new NameSort());
        System.out.println(list);
    }
}