How to find time taken to run a Java program?

Question

I have a Java application that I\'ve been working on and I just realized that the program has to return a value in less than a minute, but don\'t know how to find or display

Answer 1

This is a typical usecase for aspects, for example using Spring AOP:

@Aspect
public class TimerAspect {

    private static final Logger LOG = Logger.getLogger(TimerAspect.class);

    @Around("com.xyz.myapp.MyClass.myMethod()")
    public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
        long startTime = System.nanoTime();
        Object retVal = pjp.proceed();
        long endTime = System.nanoTime();
        LOG.info(String.format("Call to %s.%s with args %s took %s ns", pjp.getTarget(), pjp.getSignature(), Arrays.toString(pjp.getArgs()), endTime - startTime));
        return retVal;
    }
}

And in your application context: