How to use multiple syncronized threads to sort an array?

I want to sort an array using multiple syncronized threads. For example I want to use at least 2 threads开发者_Python百科 to sort the array and another thread to show me at some moments the situation of sorting. Some ideas please?

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You can employ JSR 166y Fork Join framework to do parallel merge sort. You can see examples here and here.

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Have you looked at:

java.util.Arrays.sort();

It doesn't use 2 threads - but how can that possibly be a requirement?