Java asynchronously call a method for target output

A basic parallelStream will do exactly that:

boolean match = inputs.parallelStream().anyMatch(input -> check(input));

Returns early with match==true, iff some input is found that matches check. match will be false if all inputs are checked and none matched.

In the standard case it will use the fork/join thread pool. But with some further effort you can avoid that.

Here is a really simple working example to achieve what you are asking for

Future<Boolean> future = CompletableFuture.runAsync(() -> {
    // Do your checks, if true, just return this future
    System.out.println("I'll run in a separate thread than the main thread.");
});

// Now, you may want to block the main thread waiting for the result
while(!future.isDone()) {
    // Meanwhile, you can do others stuff
    System.out.println("Doing other stuff or simply waiting...");
}

// When future.isDone() returns, you will be able to retrieve the result
Boolean result = future.get();