测试List对象排序

实体类：

package test;

public class NightlyRate {

    private String rate;

    public String getRate() {
        return rate;
    }

    public void setRate(String rate) {
        this.rate = rate;
    }
    public NightlyRate(String rate){
        this.rate = rate;
    }
}

package test;

import java.util.List;

public class RateInfo {

    private String name;

    private List<NightlyRate> nightlyRates;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<NightlyRate> getNightlyRates() {
        return nightlyRates;
    }

    public void setNightlyRates(List<NightlyRate> nightlyRates) {
        this.nightlyRates = nightlyRates;
    }
    public RateInfo(String name){
        this.name = name;
    }
    public RateInfo(String name,List<NightlyRate> nightlyRates){
        this.name = name;
        this.nightlyRates = nightlyRates;
    }
}

测试类：

package test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import aA.RandomDemo;
/**
 *
 * @Description:测试List排序
 * @date 2018年7月16日,下午11:10:14
 */
public class testDemo {

    public static void main(String[] args) {
        //List<RateInfo>的容量,最大容量：29300则nightNum最大容量为：5
        //rateNum容量与nightNum容量成反比
        int rateNum = 2000;

        //List<NightlyRate>的容量
        int nightNum = 20;
        List<RateInfo> rList = new ArrayList<RateInfo>();
        System.out.println("********************《start添加原始数据》************************************");
        //添加原始数据
        for(int i=0;i<rateNum;i++){
            List<NightlyRate> nightlyRates = new ArrayList<NightlyRate>();
            for(int j = 0;j<nightNum;j++){
                NightlyRate nightlyRate = new NightlyRate(RandomDemo.getRandom(4,RandomDemo.TYPE.NUMBER));
                nightlyRates.add(nightlyRate);
            }
            rList.add(new RateInfo(RandomDemo.getRandom(10,RandomDemo.TYPE.LETTER_CAPITAL),nightlyRates));
        }

        //原始数据的输出
        for (RateInfo rateInfo : rList) {
            System.out.println("RateInfo原始数据："+rateInfo.getName());
            System.out.print("    ---->  "+"排序前价格：");
            for(int j = 0;j<nightNum;j++){
                System.out.print(rateInfo.getNightlyRates().get(j).getRate()+",");
            }
            System.out.println();
        }
        System.out.println("********************《end添加原始数据》***************************************");
        System.out.println();
        sortList(rList, nightNum, rateNum);
    }

    /**
     *
     * @Description: 集合排序（rList(保存RateInfod对象)中有一个List的属性 nightlyRates(保存NightlyRate对象)
     * 首先给属性nightlyRates排序，然后再个rList根据排好序的属性nightlyRates第一个对象进行排序）
     * @param @param rList
     * @param @param nightNum
     * @param @param rateNum
     * @return void
     * @throws
     */
    public static void sortList(List<RateInfo> rList,int nightNum,int rateNum){
        long start;
        long end;
        long sortInTime = 0;
        long sortOutTime = 0;
        System.out.println("*******************《start RateInfo内属性价格排序》***************************");
        for (RateInfo rateInfo : rList) {
            //进行价格排序
            start = System.currentTimeMillis();
            Collections.sort(rateInfo.getNightlyRates(), new Comparator<NightlyRate>() {
                public int compare(NightlyRate R1, NightlyRate R2) {
                    Integer rateCode1 = Integer.parseInt(R1.getRate());
                    Integer rateCode2 = Integer.parseInt(R2.getRate());
                    if (rateCode1 > rateCode2) {
                        return 1;
                    }
                    if (rateCode1 == rateCode2) {
                        return 0;
                    }
                    return -1;
                }
            });
//            Collections.sort(rateInfo.getNightlyRates(), Comparator.comparing(NightlyRate::getRate));
            end = System.currentTimeMillis();
            sortInTime = end-start;
            System.out.println("RateInfo数据内容排序getNightlyRates()价格："+rateInfo.getName());
            System.out.print("    ---->  "+"排序后价格：");
            for(int j = 0;j<nightNum;j++){
                System.out.print(rateInfo.getNightlyRates().get(j).getRate()+",");
            }
            System.out.println();
        }
        System.out.println("*******************《end RateInfo内属性价格排序》****************************");
        System.out.println();
        System.out.println("**********************《start RateInfo排序》********************************");
        start = System.currentTimeMillis();
        Collections.sort(rList, new Comparator<RateInfo>() {
            public int compare(RateInfo R1, RateInfo R2) {
                Integer rateCode1 = Integer.parseInt(R1.getNightlyRates().get(0).getRate());
                Integer rateCode2 = Integer.parseInt(R2.getNightlyRates().get(0).getRate());
                if (rateCode1 > rateCode2) {
                return 1;
                }
                if (rateCode1 == rateCode2) {
                    return 0;
                }
                return -1;
            }
        });
        end = System.currentTimeMillis();
        sortOutTime = end-start;
        for(int i=0;i<rateNum;i++){
            System.out.println("RateInfo的getNightlyRates()的第一个对象数据排序："+rList.get(i).getName());
            System.out.print("    ---->  "+"排序后价格：");
            for(int j = 0;j<nightNum;j++){
                System.out.print(rList.get(i).getNightlyRates().get(j).getRate()+",");
            }
            System.out.println();
        }
        System.out.println("**********************《end RateInfo排序》**********************************");
        System.out.println("RateInfo内部价格排序运行时间："+sortInTime);
        System.out.println("RateInfo排序运行时间："+sortOutTime);
    }
}

测试结果：