How to calculate the running time of method in java?

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how I can make my program to calculate the running time of a method once the user click JButton until the result shown in JTextBox? i don't want the whole program running time.thanks the code is this.

Java

long startTime = System.currentTimeMillis();
     byte[]  plain = plaintext.getText().getBytes();
     byte[] K = key.getText().getBytes();
     byte[] encrypted = encrypt(plain, K);
     String a = bytesToHex(encrypted);
     encryptedtext.setText(a);

    long stopTime = System.currentTimeMillis();
    long elapsedTime = stopTime - startTime;
    time.setText(elapsedTime);

What I have tried:

i tried adding the method between the running time method

Posted 26-Mar-18 18:28pm

Member 13725790

Updated 26-Mar-18 18:38pm

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Richard MacCutchan 27-Mar-18 4:45am

What is the problem with this code?

Member 13725790 28-Mar-18 1:38am

The wrong that it’s calculate the whole running program. What i want is to calculate only a particular method. Which is encryption because later i want to compare between the running time of method when the user enter different keys and different text size

Richard MacCutchan 28-Mar-18 3:43am

Then add the time collectors at just the beginning and end of the method you want to measure. It's really not that complicated.

Member 13725790 28-Mar-18 9:26am

I did but still same result 😪

Richard MacCutchan 28-Mar-18 9:30am

What result? What is difficult about the following sequence:
Capture current time.
Run method
Capture current time.

The difference between the two times is the time taken for the method. You may need to use the milliseconds version to get reasonable accuracy.

Member 13725790 28-Mar-18 10:38am

The results for example at first running time it gives 35 then i enter another data and i hit the button it gives 0 then again 1 then it gives random numbers. I will try it in console maybe it will give clear result. Thank you so much Richard

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