https://openjdk.java.net/ 
abstract class com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl extends com.sun.tools.jdi.EventSetImpl$EventImpl
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl
  super_class: com.sun.tools.jdi.EventSetImpl$EventImpl
{
  private com.sun.jdi.ThreadReference thread;
    descriptor: Lcom/sun/jdi/ThreadReference;
    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$Events$EventsCommon, int, com.sun.jdi.ThreadReference);
    descriptor: (Lcom/sun/tools/jdi/EventSetImpl;Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$EventsCommon;ILcom/sun/jdi/ThreadReference;)V
    flags: (0x0000) 
    Code:
      stack=4, locals=5, args_size=5
        start local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
        start local 2 // com.sun.tools.jdi.JDWP$Event$Composite$Events$EventsCommon evt
        start local 3 // int requestID
        start local 4 // com.sun.jdi.ThreadReference thread
         0: .line 174
            aload 0 /* this */
            aload 1
            putfield com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.this$0:Lcom/sun/tools/jdi/EventSetImpl;
         1: .line 175
            aload 0 /* this */
            aload 1
            aload 2 /* evt */
            iload 3 /* requestID */
            invokespecial com.sun.tools.jdi.EventSetImpl$EventImpl.<init>:(Lcom/sun/tools/jdi/EventSetImpl;Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$EventsCommon;I)V
         2: .line 176
            aload 0 /* this */
            aload 4 /* thread */
            putfield com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.thread:Lcom/sun/jdi/ThreadReference;
         3: .line 177
            return
        end local 4 // com.sun.jdi.ThreadReference thread
        end local 3 // int requestID
        end local 2 // com.sun.tools.jdi.JDWP$Event$Composite$Events$EventsCommon evt
        end local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lcom/sun/tools/jdi/EventSetImpl$ThreadedEventImpl;
            0    4     2        evt  Lcom/sun/tools/jdi/JDWP$Event$Composite$Events$EventsCommon;
            0    4     3  requestID  I
            0    4     4     thread  Lcom/sun/jdi/ThreadReference;
    MethodParameters:
           Name  Flags
      this$0     final
      evt        
      requestID  
      thread     

  public com.sun.jdi.ThreadReference thread();
    descriptor: ()Lcom/sun/jdi/ThreadReference;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
         0: .line 180
            aload 0 /* this */
            getfield com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.thread:Lcom/sun/jdi/ThreadReference;
            areturn
        end local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/tools/jdi/EventSetImpl$ThreadedEventImpl;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
         0: .line 184
            new java.lang.StringBuilder
            dup
            aload 0 /* this */
            invokevirtual com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.eventName:()Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc " in thread "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.thread:Lcom/sun/jdi/ThreadReference;
            invokeinterface com.sun.jdi.ThreadReference.name:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/sun/tools/jdi/EventSetImpl$ThreadedEventImpl;
}
SourceFile: "EventSetImpl.java"
NestHost: com.sun.tools.jdi.EventSetImpl
InnerClasses:
  abstract EventImpl = com.sun.tools.jdi.EventSetImpl$EventImpl 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
  abstract EventsCommon = com.sun.tools.jdi.JDWP$Event$Composite$Events$EventsCommon of com.sun.tools.jdi.JDWP$Event$Composite$Events