https://openjdk.java.net/ 
public interface sun.jvm.hotspot.gc.g1.HeapRegionClosure
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.jvm.hotspot.gc.g1.HeapRegionClosure
  super_class: java.lang.Object
{
  public abstract void doHeapRegion(sun.jvm.hotspot.gc.g1.HeapRegion);
    descriptor: (Lsun/jvm/hotspot/gc/g1/HeapRegion;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      hr    
}
SourceFile: "HeapRegionClosure.java"