Time based calculation in Java

Question

I am creating a program that makes a calculation every minute. I don't know exactly how to do this efficiently, but this is some pseudo code I have written so far:

 stockCalcTimerH = System.currentTimeMillis() - 1; stockCalcTimerI = stockCalcTimerH; stockCalcTimer = System.currentTimeMillis(); if (stockCalcTimerI < stockCalcTimer) { *do calcuations* stockCalcTimerI + 60000;

When I print both values out on the screen, it comes out as this:

stockCalcTimerI = 1395951070595 stockCalcTimer = 1395951010596

It only subtracts the number, and doesn't add the 60000 milliseconds... I'm kind of new to Java, but any feedback helps.

Thanks for reading!!

What do you mean by stockCalcTimerI + 60000; ? If you mean stockCalcTimerI += 60000; then ok never adds 60000 milliseconds. — Stathis Andronikos
– Stathis Andronikos, Commented Mar 27, 2014 at 20:40

Obicere · Accepted Answer · 2014-03-27 20:23:27Z

stockCalcTimerI + 60000;

The new value never gets assigned to a variable.

Change that to:

stockCalcTimerI += 60000;

Which is the same as

stockCalcTimerI = stockCalcTimerI + 60000;

ericbn · Accepted Answer · 2014-03-27 21:07:50Z

You can use java.util.Timer class to schedule runs.

TimerTask task = new TimerTask() { @Override public void run() { // do calculations } }; int delay = 0; // no delay, execute immediately int interval = 60*1000; // every minute new Timer().scheduleAtFixedRate(task, delay, interval);

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