How do I time a method's execution in Java?

To time the execution of a method in Java, you can use the System.nanoTime method to get the current time before and after the method is called, and then subtract the start time from the end time to get the elapsed time. Here's an example of how you can do this:

public class Main {
    public static void main(String[] args) {
        long startTime = System.nanoTime();

        // Call the method to be timed
        long result = doSomething();

        long endTime = System.nanoTime();
        long elapsedTime = endTime - startTime;

        System.out.println("Elapsed time: " + elapsedTime + " nanoseconds");
    }

    public static long doSomething() {
        // Code for the method goes here
    }
}

The System.nanoTime method returns the current time in nanoseconds. You can also use the System.currentTimeMillis method, which returns the current time in milliseconds.

Keep in mind that the time returned by these methods is not necessarily the wall clock time - it may be the elapsed time of the process or the CPU time used by the process. The actual meaning of the value returned by these methods depends on the underlying operating system and hardware.

I hope this helps! Let me know if you have any questions.