[Java advanced] HashSet, LinkedHashSet and TreeSet

HashSet: Unordered
LinkedHashSet: According to the insertion order
TreeSet: Sort from small to large

import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.TreeSet;
  
public class TestCollection {
    public static void main(String[] args) {
        HashSet<Integer> numberSet1 =new HashSet<Integer>();
        //HashSet中的数据不是按照插入顺序存放
        numberSet1.add(88);
        numberSet1.add(8);
        numberSet1.add(888);
          
        System.out.println(numberSet1);
          
        LinkedHashSet<Integer> numberSet2 =new LinkedHashSet<Integer>();
        //LinkedHashSet中的数据是按照插入顺序存放
        numberSet2.add(88);
        numberSet2.add(8);
        numberSet2.add(888);
          
        System.out.println(numberSet2);
        TreeSet<Integer> numberSet3 =new TreeSet<Integer>();
        //TreeSet 中的数据是进行了排序的
        numberSet3.add(88);
        numberSet3.add(8);
        numberSet3.add(888);
          
        System.out.println(numberSet3);
          
    }

Reprinted from: https://how2j.cn/k/collection/collection-sets/691.html#nowhere