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ParallelStreamDemo.java
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32 lines (26 loc) · 1.04 KB
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package stream;
import java.util.Arrays;
import java.util.Random;
import java.util.stream.IntStream;
public class ParallelStreamDemo {
public static void main(String[] args) {
Random random = new Random();
int[] list = random.ints(200_000_000).toArray();
System.out.println("Number of processors: " +
Runtime.getRuntime().availableProcessors());
long startTime = System.currentTimeMillis();
int[] list1 = IntStream.of(list).filter(e -> e > 0).sorted()
.limit(5).toArray();
System.out.println(Arrays.toString(list1));
long endTime = System.currentTimeMillis();
System.out.println("Sequential execution time is " +
(endTime - startTime) + " milliseconds");
startTime = System.currentTimeMillis();
int[] list2 = IntStream.of(list).parallel().filter(e -> e > 0)
.sorted().limit(5).toArray();
System.out.println(Arrays.toString(list2));
endTime = System.currentTimeMillis();
System.out.println("Parallel execution time is " +
(endTime - startTime) + " milliseconds");
}
}