利用Collections.sort給對象排序，查找對象裏面自己想要的值（核心代碼邏輯實現）

直接上代碼，根據我多年的工作經驗，下面這段代碼經過改編，有可能會經常用到，如下：

package com.itmuch.cloud.test;

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

/**
 * @author:mischen
 * @date:2020/3/27 22:50
 */
public class ColleticonTest {
    int a ;
    int b ;
    public ColleticonTest(int a,int b){
        this.a = a;
        this.b = b;
    }

    @Override
    public String toString() {
        return "{" +
                "a=" + a +
                ", b=" + b +
                '}';
    }

    public static void main(String[] args){
        List<ColleticonTest> intlist = new ArrayList<ColleticonTest>();
        intlist.add( new ColleticonTest(2,45));
        intlist.add( new ColleticonTest(456,-1));
        intlist.add( new ColleticonTest(999,456));
        intlist.add( new ColleticonTest(8888,678));
        intlist.add( new ColleticonTest(3,3));
        System.out.println(intlist);
        Collections.sort(intlist, new Comparator<ColleticonTest>() {
            @Override
            public int compare(ColleticonTest o1, ColleticonTest o2) {
                if (o1.b>o2.b)
                    return 1;
                else if(o1.b<o2.b)
                    return -1;
                return 0;
            }
        });
        System.out.println(intlist);
        System.out.println(intlist.get(0));
        System.out.println(intlist.get(intlist.size()-1));
    }


}