工具类
# 工具类
# StopWatch
Spring 提供的计时工具类，线程不安全，仅用作开发阶段测试。使用如下
StopWatch stopWatch = new StopWatch("计时1");
stopWatch.start("任务1");
StringJoiner sj = new StringJoiner(":", "[", "]");
sj.add("George").add("Sally").add("Fred");
String desiredString = sj.toString();
System.out.println(desiredString);
stopWatch.stop();
stopWatch.start("任务2");
List<Integer> numbers = Arrays.asList(1, 2, 3, 4);
String commaSeparatedNumbers = numbers.stream()
.map(i -> i.toString())
.collect(Collectors.joining(", "));
System.out.println(commaSeparatedNumbers);
stopWatch.stop();
System.out.println(stopWatch.prettyPrint());// 美化后输出
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
输出如下
StopWatch '计时1': running time = 627100 ns
---------------------------------------------
ns % Task name
---------------------------------------------
000140900 022% 任务1
000486200 078% 任务2
1
2
3
4
5
6
2
3
4
5
6
上次更新: 2021/06/21, 15:45:42