我在main方法上有以下代码,当我遍历Set并打印值时,值已经排序.什么原因？
Set<Integer> set = new HashSet<Integer>();
set.add(2);
set.add(7);
set.add(3);
set.add(9);
set.add(6);
for(int i : set) {
System.out.println(i);
}
输出：
2 3 6 7 9
解决方法
那只是巧合. A
HashSet不保留或保证任何订购.
It makes no guarantees as to the iteration order of the set; in particular,it does not guarantee that the order will remain constant over time.
