http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
class io.netty.util.Signal$1 extends io.netty.util.ConstantPool<io.netty.util.Signal>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.util.Signal$1
  super_class: io.netty.util.ConstantPool
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.util.Signal$1 this
         0: .line 27
            aload 0 /* this */
            invokespecial io.netty.util.ConstantPool.<init>:()V
            return
        end local 0 // io.netty.util.Signal$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/util/Signal$1;

  protected io.netty.util.Signal newConstant(int, java.lang.String);
    descriptor: (ILjava/lang/String;)Lio/netty/util/Signal;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // io.netty.util.Signal$1 this
        start local 1 // int id
        start local 2 // java.lang.String name
         0: .line 30
            new io.netty.util.Signal
            dup
            iload 1 /* id */
            aload 2 /* name */
            invokespecial io.netty.util.Signal.<init>:(ILjava/lang/String;)V
            areturn
        end local 2 // java.lang.String name
        end local 1 // int id
        end local 0 // io.netty.util.Signal$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/util/Signal$1;
            0    1     1    id  I
            0    1     2  name  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      id    
      name  

  protected io.netty.util.Constant newConstant(int, java.lang.String);
    descriptor: (ILjava/lang/String;)Lio/netty/util/Constant;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            iload 1
            aload 2
            invokevirtual io.netty.util.Signal$1.newConstant:(ILjava/lang/String;)Lio/netty/util/Signal;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lio/netty/util/ConstantPool<Lio/netty/util/Signal;>;
SourceFile: "Signal.java"
EnclosingMethod: io.netty.util.Signal
NestHost: io.netty.util.Signal
InnerClasses:
  io.netty.util.Signal$1