https://openjdk.java.net/ 
public interface jdk.internal.vm.compiler.word.PointerBase extends jdk.internal.vm.compiler.word.ComparableWord
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.internal.vm.compiler.word.PointerBase
  super_class: java.lang.Object
{
  public abstract boolean isNull();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

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