Parallel programming with threads on specific static method in java

Question

I have this code:

public final class AClass{ static Long x=0; public static Long aMethod(args...){ //commands x = aMethod(args...); x += aMethod(args...); //commands } }

I want to execute the two lines of code(the two calls of aMethod) parallel with threads.

Hi Justas, threads take as a parameter object and no methods.. — tasosxak
– tasosxak, Commented Mar 25, 2017 at 23:16
I suggest you start reading this from the start: docs.oracle.com/javase/tutorial/essential/concurrency — Justas
– Justas, Commented Mar 25, 2017 at 23:18
Oh please, this is a "Abstract" code , I hoped to understand the essence — tasosxak
– tasosxak, Commented Mar 25, 2017 at 23:25

unjankify · Accepted Answer · 2017-03-25 23:31:06Z

1

This is a relatively simple problem and the following code should solve your predicament

Thread thread1 = new Thread() { public void run() { x = aMethod(args...); } }; Thread thread2 = new Thread() { public void run() { x += aMethod(args...); } }; thread1.start(); thread2.start();

Then you join the result with:

thread1.join(); thread2.join();

These 2 lines of code will throw an InterruptedException and will need to be handled with a try/catch

answered Mar 25, 2017 at 23:31

unjankify

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4 Comments

Tesseract Over a year ago

That approach is not thread safe. If both threads modify the variable at the same time you could get undefined behavior. You can fix it by making x an AtomicLong. Alternatively you could also work with CompletableFuture.

Tesseract Over a year ago

Or you could use parallel streams. That would by far be the shortest way to write it.

Nathan Hughes Over a year ago

Not a good solution. If thread2 finishes before thread1 then thread1 will overwrite the value in x.

tasosxak Over a year ago

If i make method synchronized?

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