https://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public interface org.apache.lucene.analysis.tokenattributes.OffsetAttribute extends org.apache.lucene.util.Attribute
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.lucene.analysis.tokenattributes.OffsetAttribute
  super_class: java.lang.Object
{
  public abstract int startOffset();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void setOffset(int, int);
    descriptor: (II)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
             Name  Flags
      startOffset  
      endOffset    

  public abstract int endOffset();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "OffsetAttribute.java"