How to time Java program execution speed

Question

How do you time the execution of a java program? I'm not sure what class I should use to do this.

I'm kinda looking for something like:

// Some timer starts here for (int i = 0; i < length; i++) {   // Do something } // End timer here  System.out.println("Total execution time: " + totalExecutionTime); 

Answer 1

final long startTime = System.currentTimeMillis(); for (int i = 0; i < length; i++) {   // Do something } final long endTime = System.currentTimeMillis();  System.out.println("Total execution time: " + (endTime - startTime));