public final class sun.misc.ThreadGroupUtils
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: sun.misc.ThreadGroupUtils
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // sun.misc.ThreadGroupUtils this
         0: .line 36
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 38
            return
        end local 0 // sun.misc.ThreadGroupUtils this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lsun/misc/ThreadGroupUtils;

  public static java.lang.ThreadGroup getRootThreadGroup();
    descriptor: ()Ljava/lang/ThreadGroup;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=2, args_size=0
         0: .line 47
            invokestatic java.lang.Thread.currentThread:()Ljava/lang/Thread;
            invokevirtual java.lang.Thread.getThreadGroup:()Ljava/lang/ThreadGroup;
            astore 0 /* currentTG */
        start local 0 // java.lang.ThreadGroup currentTG
         1: .line 48
            aload 0 /* currentTG */
            invokevirtual java.lang.ThreadGroup.getParent:()Ljava/lang/ThreadGroup;
            astore 1 /* parentTG */
        start local 1 // java.lang.ThreadGroup parentTG
         2: .line 49
            goto 5
         3: .line 50
      StackMap locals: java.lang.ThreadGroup java.lang.ThreadGroup
      StackMap stack:
            aload 1 /* parentTG */
            astore 0 /* currentTG */
         4: .line 51
            aload 0 /* currentTG */
            invokevirtual java.lang.ThreadGroup.getParent:()Ljava/lang/ThreadGroup;
            astore 1 /* parentTG */
         5: .line 49
      StackMap locals:
      StackMap stack:
            aload 1 /* parentTG */
            ifnonnull 3
         6: .line 53
            aload 0 /* currentTG */
            areturn
        end local 1 // java.lang.ThreadGroup parentTG
        end local 0 // java.lang.ThreadGroup currentTG
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            1    7     0  currentTG  Ljava/lang/ThreadGroup;
            2    7     1   parentTG  Ljava/lang/ThreadGroup;
}
SourceFile: "ThreadGroupUtils.java"