https://openjdk.java.net/ 
public interface sun.nio.ch.DirectBuffer
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.nio.ch.DirectBuffer
  super_class: java.lang.Object
{
  public abstract long address();
    descriptor: ()J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.lang.Object attachment();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract jdk.internal.ref.Cleaner cleaner();
    descriptor: ()Ljdk/internal/ref/Cleaner;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "DirectBuffer.java"