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1、创建一个继承 Comparator 的类

package com.how2java.tmall.comparator; import java.util.Comparator; import com.how2java.tmall.pojo.Product; public class ProductAllComparator implements Comparator
   
    {
        @Override    public int compare(Product p1, Product p2) {
           return p2.getReviewCount()*p2.getSaleCount()-p1.getReviewCount()*p1.getSaleCount();    } }
   

2、对数组进行排序

Collections.sort(list, new ProductAllComparator());

拓展：一个比较器包含多种排序方法

public class ProductComparator implements Comparator
   
     {
       private String sort;     public ProductComparator(String sort) {
           this.sort = sort;    }     public ProductComparator() {
       }     @Override    public int compare(Product o1, Product o2) {
           int result = 0;        switch (sort) {
               case "review":                result = o1.getReviewCount() - o2.getReviewCount();                break;            case "date":                result = o1.getCreateDate().compareTo(o2.getCreateDate());                break;             case "saleCount":                result = o1.getSaleCount() - o2.getSaleCount();                break;             case "price":                result = (int) (o1.getPromotePrice() - o2.getPromotePrice());                break;             case "all":                result = o1.getSaleCount() * o1.getReviewCount() - o2.getSaleCount() * o2.getSaleCount();                break;            default:                result = 0;                break;        }        return result;    }}
   

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