https://commons.apache.org/proper/commons-collections/: The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. (The Apache Software Foundation)
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public interface org.apache.commons.collections4.Transformer<I, O>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.commons.collections4.Transformer
  super_class: java.lang.Object
{
  public abstract O transform();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TI;)TO;
    MethodParameters:
       Name  Flags
      input  
}
Signature: <I:Ljava/lang/Object;O:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "Transformer.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()