65 lines
1.5 KiB
Java
65 lines
1.5 KiB
Java
// understandingcollections/jmh/Sets.java
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// (c)2016 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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// Demonstrates performance differences in Sets
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package understandingcollections.jmh;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.*;
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import java.util.concurrent.*;
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@State(Scope.Thread)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, batchSize = 5000)
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@Measurement(iterations = 5, batchSize = 5000)
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@BenchmarkMode(Mode.SingleShotTime)
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@Fork(1)
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public class Sets {
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private Set<String> set;
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@Param({
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"java.util.HashSet",
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"java.util.TreeSet",
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"java.util.LinkedHashSet",
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"java.util.concurrent.ConcurrentSkipListSet",
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"java.util.concurrent.CopyOnWriteArraySet",
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})
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private String type;
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@Param({
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"1",
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"10",
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"100",
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"1000",
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"10000",
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})
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private int size;
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private String key;
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@Setup
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public void setup() throws Exception {
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set = (Set<String>)
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Class.forName(type).newInstance();
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for(int i = 0; i < size; i++)
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set.add(Integer.toString(i));
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key = Integer.toString(size/2);
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}
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@Benchmark
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public Set<String> add() {
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set.add("test");
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return set;
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}
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@Benchmark
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public boolean contains() {
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return set.contains(key);
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}
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@Benchmark
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public void iterate(Blackhole bh) {
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Iterator<String> it = set.iterator();
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while(it.hasNext())
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bh.consume(it.next());
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}
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}
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