https://openjdk.java.net/ 
public interface sun.jvm.hotspot.oops.ObjectHeap$ObjectFilter
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.jvm.hotspot.oops.ObjectHeap$ObjectFilter
  super_class: java.lang.Object
{
  public abstract boolean canInclude(sun.jvm.hotspot.oops.Oop);
    descriptor: (Lsun/jvm/hotspot/oops/Oop;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      obj   
}
SourceFile: "ObjectHeap.java"
NestHost: sun.jvm.hotspot.oops.ObjectHeap
InnerClasses:
  public abstract ObjectFilter = sun.jvm.hotspot.oops.ObjectHeap$ObjectFilter of sun.jvm.hotspot.oops.ObjectHeap