英文:
a method to get the runtime of another method
问题
我知道如何从这里获取方法的运行时
https://stackoverflow.com/questions/180158/how-do-i-time-a-methods-execution-in-java
现在我需要多次获取运行时间，是否有一种方式可以像这样做：
public long exTime(methodToTime())
long startTime = System.nanoTime();
methodToTime();
long endTime = System.nanoTime();
long duration = (endTime - startTime);
感谢您的帮助
编辑：为了更具体，我当前的代码是
System.out.println("1001*00*10");
long startTime0 = System.nanoTime();
revealStr("1001*00*10");
long endTime0 = System.nanoTime();
long duration0 = (endTime0 - startTime0);
System.out.println("The runtime is " + endTime0);
System.out.println("10**01*1*0");
long startTime1 = System.nanoTime();
revealStr("10**01*1*0");
long endTime1 = System.nanoTime();
long duration1 = (endTime0 - startTime1);
System.out.println("The runtime is " + endTime1);
System.out.println("0*1*0**0**");
long startTime2 = System.nanoTime();
revealStr("0*1*0**0**");
long endTime2 = System.nanoTime();
long duration2 = (endTime2 - startTime2);
System.out.println("The runtime is " + endTime2);
System.out.println("****1*1***");
long startTime3 = System.nanoTime();
revealStr("****1*1***");
long endTime3 = System.nanoTime();
long duration3 = (endTime3 - startTime3);
System.out.println("The runtime is " + endTime3);
System.out.println("**********");
long startTime4 = System.nanoTime();
revealStr("**********");
long endTime4 = System.nanoTime();
long duration4 = (endTime4 - startTime4);
System.out.println("The runtime is " + endTime0);
这是重复且冗余的。
英文:
I know how to get the runtime of a method from here
https://stackoverflow.com/questions/180158/how-do-i-time-a-methods-execution-in-java
Now I need to get the run time multiple times, so is there a way to make something like
public long exTime(methodToTime())
long startTime = System.nanoTime();
methodToTime();
long endTime = System.nanoTime();
long duration = (endTime - startTime);
Thanks for your help
edit: to be more specific, my current code is
long startTime0 = System.nanoTime();
revealStr("1001*00*10");
long endTime0 = System.nanoTime();
long duration0 = (endTime0 - startTime0);
System.out.println("The runtime is " + endTime0);
System.out.println("10**01*1*0");
long startTime1 = System.nanoTime();
revealStr("10**01*1*0");
long endTime1 = System.nanoTime();
long duration1 = (endTime0 - startTime1);
System.out.println("The runtime is " + endTime1);
System.out.println("0*1*0**0**");
long startTime2 = System.nanoTime();
revealStr("0*1*0**0**");
long endTime2 = System.nanoTime();
long duration2 = (endTime2 - startTime2);
System.out.println("The runtime is " + endTime2);
System.out.println("****1*1***");
long startTime3 = System.nanoTime();
revealStr("****1*1***");
long endTime3 = System.nanoTime();
long duration3 = (endTime3 - startTime3);
System.out.println("The runtime is " + endTime3);
System.out.println("**********");
long startTime4 = System.nanoTime();
revealStr("**********");
long endTime4 = System.nanoTime();
long duration4 = (endTime4 - startTime4);
System.out.println("The runtime is " + endTime0);
which is repetitive and redundant
答案1
得分: 1
这是一个我用来比较两种方法性能的实用方法。
public static void testPerformance(long loopTime, Runnable r1, Runnable r2){
long startTime;
long endTime;
startTime = System.currentTimeMillis();
for (int i = 0; i < loopTime; i++) {
r1.run();
}
endTime = System.currentTimeMillis();
System.out.printf("循环 %d 次，总耗时 %d 秒，每次耗时 %f 毫秒\n", loopTime, (endTime - startTime) / 1000, (double) (endTime - startTime) / loopTime);
startTime = System.currentTimeMillis();
for (int i = 0; i < loopTime; i++) {
r2.run();
}
endTime = System.currentTimeMillis();
System.out.printf("循环 %d 次，总耗时 %d 秒，每次耗时 %f 毫秒\n", loopTime, (endTime - startTime) / 1000, (double) (endTime - startTime) / loopTime);
}
你可以像这样使用：
PerformanceUtils.testPerformance(loopTime, () -> {
// 做一些事情
}, () -> {
// 做一些事情
});
英文:
This is a util method I used to compare the performance of two method.
public static void testPerformance(long loopTime, Runnable r1,Runnable r2){
long startTime;
long endTime;
startTime=System.currentTimeMillis();
for (int i = 0; i < loopTime; i++) {
r1.run();
}
endTime=System.currentTimeMillis();
System.out.printf("loop %d times, total spend %d s, each spend %f ms\n",loopTime,(endTime-startTime)/1000,(double)(endTime-startTime)/loopTime);
startTime=System.currentTimeMillis();
for (int i = 0; i < loopTime; i++) {
r2.run();
}
endTime=System.currentTimeMillis();
System.out.printf("loop %d times, total spend %d s, each spend %f ms\n",loopTime,(endTime-startTime)/1000,(double)(endTime-startTime)/loopTime);
}
You can use like this:
PerformanceUtils.testPerformance(loopTime,()->{
//do some thing
},()->{
//do some thing
});
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