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) 
public final class io.netty.handler.codec.mqtt.MqttFixedHeader
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.mqtt.MqttFixedHeader
  super_class: java.lang.Object
{
  private final io.netty.handler.codec.mqtt.MqttMessageType messageType;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean isDup;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final io.netty.handler.codec.mqtt.MqttQoS qosLevel;
    descriptor: Lio/netty/handler/codec/mqtt/MqttQoS;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final boolean isRetain;
    descriptor: Z
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final int remainingLength;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(io.netty.handler.codec.mqtt.MqttMessageType, boolean, io.netty.handler.codec.mqtt.MqttQoS, boolean, int);
    descriptor: (Lio/netty/handler/codec/mqtt/MqttMessageType;ZLio/netty/handler/codec/mqtt/MqttQoS;ZI)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=6, args_size=6
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
        start local 1 // io.netty.handler.codec.mqtt.MqttMessageType messageType
        start local 2 // boolean isDup
        start local 3 // io.netty.handler.codec.mqtt.MqttQoS qosLevel
        start local 4 // boolean isRetain
        start local 5 // int remainingLength
         0: .line 34
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 40
            aload 0 /* this */
            aload 1 /* messageType */
            ldc "messageType"
            invokestatic io.netty.util.internal.ObjectUtil.checkNotNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            checkcast io.netty.handler.codec.mqtt.MqttMessageType
            putfield io.netty.handler.codec.mqtt.MqttFixedHeader.messageType:Lio/netty/handler/codec/mqtt/MqttMessageType;
         2: .line 41
            aload 0 /* this */
            iload 2 /* isDup */
            putfield io.netty.handler.codec.mqtt.MqttFixedHeader.isDup:Z
         3: .line 42
            aload 0 /* this */
            aload 3 /* qosLevel */
            ldc "qosLevel"
            invokestatic io.netty.util.internal.ObjectUtil.checkNotNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            checkcast io.netty.handler.codec.mqtt.MqttQoS
            putfield io.netty.handler.codec.mqtt.MqttFixedHeader.qosLevel:Lio/netty/handler/codec/mqtt/MqttQoS;
         4: .line 43
            aload 0 /* this */
            iload 4 /* isRetain */
            putfield io.netty.handler.codec.mqtt.MqttFixedHeader.isRetain:Z
         5: .line 44
            aload 0 /* this */
            iload 5 /* remainingLength */
            putfield io.netty.handler.codec.mqtt.MqttFixedHeader.remainingLength:I
         6: .line 45
            return
        end local 5 // int remainingLength
        end local 4 // boolean isRetain
        end local 3 // io.netty.handler.codec.mqtt.MqttQoS qosLevel
        end local 2 // boolean isDup
        end local 1 // io.netty.handler.codec.mqtt.MqttMessageType messageType
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    7     0             this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;
            0    7     1      messageType  Lio/netty/handler/codec/mqtt/MqttMessageType;
            0    7     2            isDup  Z
            0    7     3         qosLevel  Lio/netty/handler/codec/mqtt/MqttQoS;
            0    7     4         isRetain  Z
            0    7     5  remainingLength  I
    MethodParameters:
                 Name  Flags
      messageType      
      isDup            
      qosLevel         
      isRetain         
      remainingLength  

  public io.netty.handler.codec.mqtt.MqttMessageType messageType();
    descriptor: ()Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 48
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.messageType:Lio/netty/handler/codec/mqtt/MqttMessageType;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;

  public boolean isDup();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 52
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.isDup:Z
            ireturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;

  public io.netty.handler.codec.mqtt.MqttQoS qosLevel();
    descriptor: ()Lio/netty/handler/codec/mqtt/MqttQoS;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 56
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.qosLevel:Lio/netty/handler/codec/mqtt/MqttQoS;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;

  public boolean isRetain();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 60
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.isRetain:Z
            ireturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;

  public int remainingLength();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 64
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.remainingLength:I
            ireturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
         0: .line 69
            new java.lang.StringBuilder
            dup
            aload 0 /* this */
            invokestatic io.netty.util.internal.StringUtil.simpleClassName:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         1: .line 70
            bipush 91
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         2: .line 71
            ldc "messageType="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.messageType:Lio/netty/handler/codec/mqtt/MqttMessageType;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
         3: .line 72
            ldc ", isDup="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.isDup:Z
            invokevirtual java.lang.StringBuilder.append:(Z)Ljava/lang/StringBuilder;
         4: .line 73
            ldc ", qosLevel="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.qosLevel:Lio/netty/handler/codec/mqtt/MqttQoS;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
         5: .line 74
            ldc ", isRetain="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.isRetain:Z
            invokevirtual java.lang.StringBuilder.append:(Z)Ljava/lang/StringBuilder;
         6: .line 75
            ldc ", remainingLength="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttFixedHeader.remainingLength:I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
         7: .line 76
            bipush 93
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         8: .line 77
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         9: .line 69
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttFixedHeader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   10     0  this  Lio/netty/handler/codec/mqtt/MqttFixedHeader;
}
SourceFile: "MqttFixedHeader.java"