eric/OnJava8-Examples
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changed to AtomicInteger

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This commit is contained in:
Bruce Eckel 2017-01-02 14:20:54 -08:00
parent 620703ef6f
commit 65246aea15
1 changed files with 7 additions and 5 deletions
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12
concurrent/ParallelStreamPuzzle2.java
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@ -6,6 +6,7 @@ import java.util.*;
import java.util.function.*; import java.util.function.*;
import java.util.stream.*; import java.util.stream.*;
import java.util.concurrent.*; import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.nio.file.*; import java.nio.file.*;
public class ParallelStreamPuzzle2 { public class ParallelStreamPuzzle2 {
@ -13,11 +14,12 @@ public class ParallelStreamPuzzle2 {
new ConcurrentLinkedDeque<>(); new ConcurrentLinkedDeque<>();
static class static class
IntGenerator implements Supplier<Integer> { IntGenerator implements Supplier<Integer> {
private int current = 0; private AtomicInteger current =
public synchronized Integer get() { // [1] new AtomicInteger();
trace.add(current + ": " + public Integer get() {
trace.add(current.get() + ": " +
Thread.currentThread().getName()); Thread.currentThread().getName());
return current++; return current.getAndIncrement();
} }
} }
public static void public static void
@ -32,5 +34,5 @@ public class ParallelStreamPuzzle2 {
} }
} }
/* Output: /* Output:
[2, 3, 4, 5, 6, 7, 8, 9, 10, 63] [4, 25, 27, 32, 37, 44, 49, 56, 61, 73]
*/ */