https://openjdk.java.net/ 
class com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl extends com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl implements com.sun.jdi.event.ClassPrepareEvent
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl
  super_class: com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl
{
  private com.sun.jdi.ReferenceType referenceType;
    descriptor: Lcom/sun/jdi/ReferenceType;
    flags: (0x0002) ACC_PRIVATE

  final com.sun.tools.jdi.EventSetImpl this$0;
    descriptor: Lcom/sun/tools/jdi/EventSetImpl;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.sun.tools.jdi.EventSetImpl, com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare);
    descriptor: (Lcom/sun/tools/jdi/EventSetImpl;Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$ClassPrepare;)V
    flags: (0x0000) 
    Code:
      stack=6, locals=3, args_size=3
        start local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
        start local 2 // com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare evt
         0: .line 366
            aload 0 /* this */
            aload 1
            putfield com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.this$0:Lcom/sun/tools/jdi/EventSetImpl;
         1: .line 367
            aload 0 /* this */
            aload 1
            aload 2 /* evt */
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.requestID:I
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.thread:Lcom/sun/tools/jdi/ThreadReferenceImpl;
            invokespecial com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.<init>:(Lcom/sun/tools/jdi/EventSetImpl;Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$EventsCommon;ILcom/sun/jdi/ThreadReference;)V
         2: .line 368
            aload 0 /* this */
            aload 0 /* this */
            getfield com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.vm:Lcom/sun/tools/jdi/VirtualMachineImpl;
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.typeID:J
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.refTypeTag:B
         3: .line 369
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.signature:Ljava/lang/String;
         4: .line 368
            invokevirtual com.sun.tools.jdi.VirtualMachineImpl.referenceType:(JILjava/lang/String;)Lcom/sun/tools/jdi/ReferenceTypeImpl;
            putfield com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.referenceType:Lcom/sun/jdi/ReferenceType;
         5: .line 370
            aload 0 /* this */
            getfield com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.referenceType:Lcom/sun/jdi/ReferenceType;
            checkcast com.sun.tools.jdi.ReferenceTypeImpl
            aload 2 /* evt */
            getfield com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare.status:I
            invokevirtual com.sun.tools.jdi.ReferenceTypeImpl.setStatus:(I)V
         6: .line 371
            return
        end local 2 // com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare evt
        end local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lcom/sun/tools/jdi/EventSetImpl$ClassPrepareEventImpl;
            0    7     2   evt  Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$ClassPrepare;
    MethodParameters:
        Name  Flags
      this$0  final
      evt     

  public com.sun.jdi.ReferenceType referenceType();
    descriptor: ()Lcom/sun/jdi/ReferenceType;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
         0: .line 374
            aload 0 /* this */
            getfield com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.referenceType:Lcom/sun/jdi/ReferenceType;
            areturn
        end local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/tools/jdi/EventSetImpl$ClassPrepareEventImpl;

  java.lang.String eventName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
         0: .line 378
            ldc "ClassPrepareEvent"
            areturn
        end local 0 // com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/tools/jdi/EventSetImpl$ClassPrepareEventImpl;
}
SourceFile: "EventSetImpl.java"
NestHost: com.sun.tools.jdi.EventSetImpl
InnerClasses:
  ClassPrepareEventImpl = com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl of com.sun.tools.jdi.EventSetImpl
  abstract ThreadedEventImpl = com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl of com.sun.tools.jdi.EventSetImpl
  Event = com.sun.tools.jdi.JDWP$Event of com.sun.tools.jdi.JDWP
  Composite = com.sun.tools.jdi.JDWP$Event$Composite of com.sun.tools.jdi.JDWP$Event
  Events = com.sun.tools.jdi.JDWP$Event$Composite$Events of com.sun.tools.jdi.JDWP$Event$Composite
  ClassPrepare = com.sun.tools.jdi.JDWP$Event$Composite$Events$ClassPrepare of com.sun.tools.jdi.JDWP$Event$Composite$Events
  abstract EventsCommon = com.sun.tools.jdi.JDWP$Event$Composite$Events$EventsCommon of com.sun.tools.jdi.JDWP$Event$Composite$Events