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.block.factory.Procedures2$AddToCollection<T> implements org.eclipse.collections.api.block.procedure.Procedure2<T, java.util.Collection<T>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection this
         0: .line 150
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/block/factory/Procedures2$AddToCollection<TT;>;

  public void value(T, java.util.Collection<T>);
    descriptor: (Ljava/lang/Object;Ljava/util/Collection;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection this
        start local 1 // java.lang.Object each
        start local 2 // java.util.Collection target
         0: .line 157
            aload 2 /* target */
            aload 1 /* each */
            invokeinterface java.util.Collection.add:(Ljava/lang/Object;)Z
            pop
         1: .line 158
            return
        end local 2 // java.util.Collection target
        end local 1 // java.lang.Object each
        end local 0 // org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/eclipse/collections/impl/block/factory/Procedures2$AddToCollection<TT;>;
            0    2     1    each  TT;
            0    2     2  target  Ljava/util/Collection<TT;>;
    Signature: (TT;Ljava/util/Collection<TT;>;)V
    MethodParameters:
        Name  Flags
      each    
      target  

  public void value(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Object
            aload 2
            checkcast java.util.Collection
            invokevirtual org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection.value:(Ljava/lang/Object;Ljava/util/Collection;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Lorg/eclipse/collections/api/block/procedure/Procedure2<TT;Ljava/util/Collection<TT;>;>;
SourceFile: "Procedures2.java"
NestHost: org.eclipse.collections.impl.block.factory.Procedures2
InnerClasses:
  private AddToCollection = org.eclipse.collections.impl.block.factory.Procedures2$AddToCollection of org.eclipse.collections.impl.block.factory.Procedures2