一 sort

/**
 * @Author ZiFan
 * @Date 2021/4/12 22:25
 * @Description
 */
public class SortDemo {
    public static void main(String[] args) {
        List<Province> provinces=new ArrayList<>();
        provinces.add(new Province("1","贵州","1005"));
        provinces.add(new Province("2","黑龙江","1003"));
        provinces.add(new Province("3","安徽","1002"));
        provinces.add(new Province("4","内蒙古","1001"));
        provinces.add(new Province("5","云南","1004"));
        System.out.println("排序前"+provinces);
        //根据区号排序
        provinces.sort(Comparator.comparing(Province::getLocalCode));
        System.out.println("根据区号排序后："+provinces);
    }
}
/**
排序前[Province(id=1, name=贵州, localCode=1005), Province(id=2, name=黑龙江, localCode=1003), Province(id=3, name=安徽, localCode=1002), Province(id=4, name=内蒙古, localCode=1001), Province(id=5, name=云南, localCode=1004)]
根据区号排序后：[Province(id=4, name=内蒙古, localCode=1001), Province(id=3, name=安徽, localCode=1002), Province(id=2, name=黑龙江, localCode=1003), Province(id=5, name=云南, localCode=1004), Province(id=1, name=贵州, localCode=1005)]

*/