http://openjdk.java.net/projects/code-tools/jmh/jmh-core/: The jmh is a Java harness for building, running, and analysing nano/micro/macro benchmarks written in Java and other languages targeting the JVM. (Oracle)
  • Aleksey Shipilev (Oracle/Sun, Red Hat)
  • Sergey Kuksenko (Oracle/Sun)
  • Anders Astrand (Oracle/BEA)
  • Staffan Friberg (Oracle/BEA)
  • Henrik Loef (Oracle/BEA) 
public class org.openjdk.jmh.util.HashMultiset<T> extends org.openjdk.jmh.util.DelegatingMultiset<T> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.openjdk.jmh.util.HashMultiset
  super_class: org.openjdk.jmh.util.DelegatingMultiset
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 8149201968248505516

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.HashMultiset this
         0: .line 34
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            invokespecial org.openjdk.jmh.util.DelegatingMultiset.<init>:(Ljava/util/Map;)V
         1: .line 35
            return
        end local 0 // org.openjdk.jmh.util.HashMultiset this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/openjdk/jmh/util/HashMultiset<TT;>;
}
Signature: <T:Ljava/lang/Object;>Lorg/openjdk/jmh/util/DelegatingMultiset<TT;>;Ljava/io/Serializable;
SourceFile: "HashMultiset.java"