comparatorChain实现对Bean多字段排序

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.comparators.ComparatorChain;

import com.google.gson.Gson;

public class Main {
    
    
    public static class Cats{
        private Integer years;
        private String  name;
        private String  entryDate;
        public Integer getYears() {
            return years;
        }
        public void setYears(Integer years) {
            this.years = years;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getEntryDate() {
            return entryDate;
        }
        public void setEntryDate(String entryDate) {
            this.entryDate = entryDate;
        }
    }

    
    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
        List<Cats> cats = new ArrayList<>();
        Cats cat = new Cats();
        cat.setEntryDate(DateUtils.formatDate(new Date(), "yyyyMMdd HH:mm:ss"));
        cat.setName("smith");
        cat.setYears(21);
        
        Cats cat1 = new Cats();
        cat1.setEntryDate(DateUtils.formatDate(new Date(), "yyyyMMdd HH:mm:ss"));
        cat1.setName("KAMIER");
        cat1.setYears(36);
        
        Cats cat2 = new Cats();
        cat2.setEntryDate(DateUtils.formatDate(new Date(), "yyyyMMdd HH:mm:ss"));
        cat2.setName("STIWEN");
        cat2.setYears(18);
        
        Cats cat3 = new Cats();
        cat3.setEntryDate(DateUtils.formatDate(new Date(), "yyyyMMdd HH:mm:ss"));
        cat3.setName("AKAI");
        cat3.setYears(88);
        cats.add(cat3);cats.add(cat2);cats.add(cat1);cats.add(cat);
        
        ComparatorChain comparatorChain = new ComparatorChain();
        comparatorChain.addComparator(new BeanComparator("entryDate"));
        //comparatorChain.addComparator(new BeanComparator("years"));
//      Arrays.sort(cats.toArray(), comparatorChain);
        Collections.sort(cats, comparatorChain);
        System.out.println("多字段排序：");
        System.out.println(new Gson().toJson(cats));
    }
}