HashSet /LinkedHashSet/TreeSet排序的不同

HashSet set1 = new HashSet(Arrays.asList("b c e f g a".split(" ")));
        LinkedHashSet set2 = new LinkedHashSet(Arrays.asList("b c e f g a".split(" ")));
        SortedSet set3 = new TreeSet(Arrays.asList("b c e f g a".split(" ")));
        System.out.println(set1);
        System.out.println(set2);
        System.out.println(set3); 
输出结果为：
[f, g, e, b, c, a]
 [b, c, e, f, g, a]
 [a, b, c, e, f, g] 
 
HashSet按Hash函数排序
LinkedHashSet按插入顺序排序
TreeSet按字母顺序排序