Using ForEach in the duties of Levenshtein

Hello

I noticed that in last homework it has been used for each of the approaches in the lambda expression.

static int[][] computeLevenshtein(List<String> wordList, boolean parallel) {  
final int LIST_SIZE = wordList.size();  
int[][] distances = new int[LIST_SIZE][LIST_SIZE];  
    IntStream stream = IntStream.range(0, LIST_SIZE);  

if (parallel)  
      stream = stream.parallel();  // Convert the stream to a parallel one  

    stream.forEach(i -> {
for (int j = 0; j < LIST_SIZE; j++)  
        distances[i][j] = Levenshtein.lev(wordList.get(i), wordList.get(j));
    });

We change the matrix of the distances here. However, in Lesson 3-3 on slides 3 and 4 we are told do not change state using the ForEach method. Or is it only because this slide 3 LongAdder is not thread-safe and so it cannot be run in parallel? Thank you.

Marian

My way of thinking:

The forEach loop is terminal operation and stateless.

That is, the distance value [i] [j] does not change if you use parallel or sequential flows.

The trouble begins if you use something like this:

List distances = new ArrayList<>();

and then later in the code:

distances.add(Levenshtein.lev(wordList.get(i), wordList.get(j)));

The order in which the items added to the list would be different from execution to execution of the parallel flow.

Hope that this help

Tags: Java

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