method to call a parallel list?

Charles arrives at Neue:

I have to iterate over the list of each object and call the method, but in parallel. After the loop, there are other declarations, which have to wait for parallel method calls. How can I do this in JAVA?

public void a(List<Object> list) {
    for(Object o : list) {
        asynchMethod(o); // this n method call must run in the same time
    }

    // wait for all asynchMethod result
    /**
     * ...other statements
     */
}

private void asynchMethod(Object o) {
    // some code
}
bramdc：

I see you are using Java 8, then you can use parallelStream's method:

public void a(List<Object> list) {
    list.parallelStream().forEach(s -> asyncMethod(o));
}

It must wait for parallel method calls

The foreach is aka its terminal operation will wait to complete until moving forward to the next line of code: Java Parallel Streams: How to wait for threads to complete in a parallel stream?

If you want some info about parallelStream: https://docs.oracle.com/javase/tutorial/collections/streams/parallelism.html#executing_streams_in_parallel

If you are wondering how many threads parallelstream uses: How many threads are spawned in parallelStream in Java 8?

Be careful with threads and pararellStream, they come with their own heap of problems. Before using them, you should always double check the situation to see if they are worth the trouble they might bring: Should I always use parallel streams if possible?

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method to call a parallel list?

Charles arrives at Neue: I have to iterate over the list of each object and call the method, but in parallel. After the loop, there are other declarations, which have to wait for parallel method calls. How can I do this in JAVA? public void a(List<Object> list

method to call a parallel list?

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