https://openjdk.java.net/ 
public interface com.sun.tools.hat.internal.model.JavaHeapObjectVisitor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.tools.hat.internal.model.JavaHeapObjectVisitor
  super_class: java.lang.Object
{
  public abstract void visit(com.sun.tools.hat.internal.model.JavaHeapObject);
    descriptor: (Lcom/sun/tools/hat/internal/model/JavaHeapObject;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      other  

  public abstract boolean exclude(com.sun.tools.hat.internal.model.JavaClass, com.sun.tools.hat.internal.model.JavaField);
    descriptor: (Lcom/sun/tools/hat/internal/model/JavaClass;Lcom/sun/tools/hat/internal/model/JavaField;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      clazz  
      f      

  public abstract boolean mightExclude();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "JavaHeapObjectVisitor.java"