Summary of methods for calculating program code execution time in Java

This paper summarizes the method of calculating the execution time of Java program code. Share with you for your reference, as follows:

Sometimes, in order to troubleshoot performance problems, it is necessary to record the time required to complete an operation. We can use the currenttimemillis() method of the system class to return the current number of milliseconds and save it in a variable. After the method is executed, call the currenttimemillis() method of the system again and calculate the difference between the two calls, Is the number of milliseconds consumed by method execution.

As shown in method 1:

The second method is calculated in nanoseconds (using system's nanotime() method):

Example code 1:

Example code 2:

The output results are similar:

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