https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public interface com.google.common.hash.Funnel<T> extends java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.hash.Funnel
  super_class: java.lang.Object
{
  public abstract void funnel(T, com.google.common.hash.PrimitiveSink);
    descriptor: (Ljava/lang/Object;Lcom/google/common/hash/PrimitiveSink;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TT;Lcom/google/common/hash/PrimitiveSink;)V
    MethodParameters:
      Name  Flags
      from  
      into  
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/io/Serializable;
SourceFile: "Funnel.java"
    RuntimeVisibleAnnotations: 
      com.google.errorprone.annotations.DoNotMock(value = "Implement with a lambda")
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()