spring计时工具类stopwatch用法

public class Test {

public static void main(String[] args) {
StopWatch stopWatch = new StopWatch();
stopWatch.start();
try {
Thread.currentThread().sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
stopWatch.stop();
System.out.println(stopWatch.prettyPrint());
}
}

或

打印每个任务执行时间，以及占总时间百分比  

package com.common.suanfa;  

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;  

import org.springframework.util.StopWatch;  

public class Singleton {
    public static void main(String[] args) throws ClassNotFoundException,
            InstantiationException, IllegalAccessException,
            IllegalArgumentException, InvocationTargetException {
        Class name = Class.forName("com.common.suanfa.Singleton");
        Method[] m = name.getDeclaredMethods();
        StopWatch stopWatch = new StopWatch("test");
        Object o = name.newInstance();
        for (Method mm : m) {
            if (mm.getName() != "main") {
                stopWatch.start(mm.getName());
                mm.invoke(o);
                stopWatch.stop();
            }
        }
        System.out.println(stopWatch.prettyPrint());
    }  

    private static void method1() {
        int i = Integer.MAX_VALUE;
        long sum = 0l;
        while (i-- > ) {
            sum += i;
        }
        System.out.println(sum);
    }  

    private static void method2() {
        int i = Integer.MAX_VALUE;
        long sum = 0l;
        while ((i -= ) > ) {
            sum += i;
        }
        System.out.println(sum);
    }
}
output:

StopWatch 'test': running time (millis) =
-----------------------------------------
ms     %     Task name
-----------------------------------------
  %  method1
  %  method2