https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
class org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure implements org.eclipse.collections.api.block.procedure.Procedure<C>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private int totalSize;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  final org.eclipse.collections.impl.multimap.AbstractImmutableMultimap this$0;
    descriptor: Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(org.eclipse.collections.impl.multimap.AbstractImmutableMultimap);
    descriptor: (Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
         0: .line 66
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure.this$0:Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap$1CountProcedure;
    MethodParameters:
        Name  Flags
      this$0  final

  public void value();
    descriptor: (Lorg/eclipse/collections/api/collection/ImmutableCollection;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
        start local 1 // org.eclipse.collections.api.collection.ImmutableCollection collection
         0: .line 75
            aload 0 /* this */
            dup
            getfield org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure.totalSize:I
            aload 1 /* collection */
            invokeinterface org.eclipse.collections.api.collection.ImmutableCollection.size:()I
            iadd
            putfield org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure.totalSize:I
         1: .line 76
            return
        end local 1 // org.eclipse.collections.api.collection.ImmutableCollection collection
        end local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0        this  Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap$1CountProcedure;
            0    2     1  collection  TC;
    Signature: (TC;)V
    MethodParameters:
            Name  Flags
      collection  

  public int getTotalSize();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
         0: .line 80
            aload 0 /* this */
            getfield org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure.totalSize:I
            ireturn
        end local 0 // org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/multimap/AbstractImmutableMultimap$1CountProcedure;

  public void value(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast org.eclipse.collections.api.collection.ImmutableCollection
            invokevirtual org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure.value:(Lorg/eclipse/collections/api/collection/ImmutableCollection;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lorg/eclipse/collections/api/block/procedure/Procedure<TC;>;
SourceFile: "AbstractImmutableMultimap.java"
EnclosingMethod: org.eclipse.collections.impl.multimap.AbstractImmutableMultimap.size:()I
NestHost: org.eclipse.collections.impl.multimap.AbstractImmutableMultimap
InnerClasses:
  CountProcedure = org.eclipse.collections.impl.multimap.AbstractImmutableMultimap$1CountProcedure