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 class io.netty.handler.codec.mqtt.MqttSubAckPayload
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.mqtt.MqttSubAckPayload
  super_class: java.lang.Object
{
  private final java.util.List<java.lang.Integer> grantedQoSLevels;
    descriptor: Ljava/util/List;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/List<Ljava/lang/Integer;>;

  public void <init>(int[]);
    descriptor: ([I)V
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=3, locals=7, args_size=2
        start local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
        start local 1 // int[] grantedQoSLevels
         0: .line 32
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 33
            aload 1 /* grantedQoSLevels */
            ifnonnull 3
         2: .line 34
            new java.lang.NullPointerException
            dup
            ldc "grantedQoSLevels"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 37
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload int[]
      StackMap stack:
            new java.util.ArrayList
            dup
            aload 1 /* grantedQoSLevels */
            arraylength
            invokespecial java.util.ArrayList.<init>:(I)V
            astore 2 /* list */
        start local 2 // java.util.List list
         4: .line 38
            aload 1 /* grantedQoSLevels */
            dup
            astore 6
            arraylength
            istore 5
            iconst_0
            istore 4
            goto 8
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload int[] java.util.List top int int int[]
      StackMap stack:
         5: aload 6
            iload 4
            iaload
            istore 3 /* v */
        start local 3 // int v
         6: .line 39
            aload 2 /* list */
            iload 3 /* v */
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 3 // int v
         7: .line 38
            iinc 4 1
      StackMap locals:
      StackMap stack:
         8: iload 4
            iload 5
            if_icmplt 5
         9: .line 41
            aload 0 /* this */
            aload 2 /* list */
            invokestatic java.util.Collections.unmodifiableList:(Ljava/util/List;)Ljava/util/List;
            putfield io.netty.handler.codec.mqtt.MqttSubAckPayload.grantedQoSLevels:Ljava/util/List;
        10: .line 42
            return
        end local 2 // java.util.List list
        end local 1 // int[] grantedQoSLevels
        end local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0   11     0              this  Lio/netty/handler/codec/mqtt/MqttSubAckPayload;
            0   11     1  grantedQoSLevels  [I
            4   11     2              list  Ljava/util/List<Ljava/lang/Integer;>;
            6    7     3                 v  I
    MethodParameters:
                  Name  Flags
      grantedQoSLevels  

  public void <init>(java.lang.Iterable<java.lang.Integer>);
    descriptor: (Ljava/lang/Iterable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=2
        start local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
        start local 1 // java.lang.Iterable grantedQoSLevels
         0: .line 44
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 45
            aload 1 /* grantedQoSLevels */
            ifnonnull 3
         2: .line 46
            new java.lang.NullPointerException
            dup
            ldc "grantedQoSLevels"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 48
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload java.lang.Iterable
      StackMap stack:
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 2 /* list */
        start local 2 // java.util.List list
         4: .line 49
            aload 1 /* grantedQoSLevels */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            astore 4
            goto 9
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload java.lang.Iterable java.util.List top java.util.Iterator
      StackMap stack:
         5: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Integer
            astore 3 /* v */
        start local 3 // java.lang.Integer v
         6: .line 50
            aload 3 /* v */
            ifnonnull 8
         7: .line 51
            goto 10
         8: .line 53
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload java.lang.Iterable java.util.List java.lang.Integer java.util.Iterator
      StackMap stack:
            aload 2 /* list */
            aload 3 /* v */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 3 // java.lang.Integer v
         9: .line 49
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload java.lang.Iterable java.util.List top java.util.Iterator
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 5
        10: .line 55
      StackMap locals: io.netty.handler.codec.mqtt.MqttSubAckPayload java.lang.Iterable java.util.List
      StackMap stack:
            aload 0 /* this */
            aload 2 /* list */
            invokestatic java.util.Collections.unmodifiableList:(Ljava/util/List;)Ljava/util/List;
            putfield io.netty.handler.codec.mqtt.MqttSubAckPayload.grantedQoSLevels:Ljava/util/List;
        11: .line 56
            return
        end local 2 // java.util.List list
        end local 1 // java.lang.Iterable grantedQoSLevels
        end local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0   12     0              this  Lio/netty/handler/codec/mqtt/MqttSubAckPayload;
            0   12     1  grantedQoSLevels  Ljava/lang/Iterable<Ljava/lang/Integer;>;
            4   12     2              list  Ljava/util/List<Ljava/lang/Integer;>;
            6    9     3                 v  Ljava/lang/Integer;
    Signature: (Ljava/lang/Iterable<Ljava/lang/Integer;>;)V
    MethodParameters:
                  Name  Flags
      grantedQoSLevels  

  public java.util.List<java.lang.Integer> grantedQoSLevels();
    descriptor: ()Ljava/util/List;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
         0: .line 59
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttSubAckPayload.grantedQoSLevels:Ljava/util/List;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttSubAckPayload;
    Signature: ()Ljava/util/List<Ljava/lang/Integer;>;

  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.MqttSubAckPayload this
         0: .line 64
            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 65
            bipush 91
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         2: .line 66
            ldc "grantedQoSLevels="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttSubAckPayload.grantedQoSLevels:Ljava/util/List;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
         3: .line 67
            bipush 93
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         4: .line 68
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         5: .line 64
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttSubAckPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lio/netty/handler/codec/mqtt/MqttSubAckPayload;
}
SourceFile: "MqttSubAckPayload.java"