39 lines
1.1 KiB
Java
39 lines
1.1 KiB
Java
// concurrent/ParallelStreamPuzzle2.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.*;
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import java.util.function.*;
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import java.util.stream.*;
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import java.util.concurrent.*;
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import java.util.concurrent.atomic.*;
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import java.nio.file.*;
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public class ParallelStreamPuzzle2 {
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public static final Deque<String> trace =
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new ConcurrentLinkedDeque<>();
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static class
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IntGenerator implements Supplier<Integer> {
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private AtomicInteger current =
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new AtomicInteger();
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public Integer get() {
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trace.add(current.get() + ": " +
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Thread.currentThread().getName());
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return current.getAndIncrement();
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}
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}
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public static void
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main(String[] args) throws Exception {
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List<Integer> x =
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Stream.generate(new IntGenerator())
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.limit(10)
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.parallel()
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.collect(Collectors.toList());
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System.out.println(x);
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Files.write(Paths.get("PSP2.txt"), trace);
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}
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}
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/* Output:
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[3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
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*/
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