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一 sort

/** * @Author ZiFan * @Date 2021/4/12 22:25 * @Description */public class SortDemo {        public static void main(String[] args) {            List
    
      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)]*/
    

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