https://developers.google.com/protocol-buffers/protobuf-java/: Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 
final class com.google.protobuf.ProtobufArrayList<E> extends com.google.protobuf.AbstractProtobufList<E> implements java.util.RandomAccess
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.protobuf.ProtobufArrayList
  super_class: com.google.protobuf.AbstractProtobufList
{
  private static final com.google.protobuf.ProtobufArrayList<java.lang.Object> EMPTY_LIST;
    descriptor: Lcom/google/protobuf/ProtobufArrayList;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    Signature: Lcom/google/protobuf/ProtobufArrayList<Ljava/lang/Object;>;

  private E[] array;
    descriptor: [Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Signature: [TE;

  private int size;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 41
            new com.google.protobuf.ProtobufArrayList
            dup
            iconst_0
            anewarray java.lang.Object
            iconst_0
            invokespecial com.google.protobuf.ProtobufArrayList.<init>:([Ljava/lang/Object;I)V
         1: .line 40
            putstatic com.google.protobuf.ProtobufArrayList.EMPTY_LIST:Lcom/google/protobuf/ProtobufArrayList;
         2: .line 44
            getstatic com.google.protobuf.ProtobufArrayList.EMPTY_LIST:Lcom/google/protobuf/ProtobufArrayList;
            invokevirtual com.google.protobuf.ProtobufArrayList.makeImmutable:()V
         3: .line 45
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static <E> com.google.protobuf.ProtobufArrayList<E> emptyList();
    descriptor: ()Lcom/google/protobuf/ProtobufArrayList;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 49
            getstatic com.google.protobuf.ProtobufArrayList.EMPTY_LIST:Lcom/google/protobuf/ProtobufArrayList;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <E:Ljava/lang/Object;>()Lcom/google/protobuf/ProtobufArrayList<TE;>;

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.protobuf.ProtobufArrayList this
         0: .line 57
            aload 0 /* this */
            bipush 10
            anewarray java.lang.Object
            iconst_0
            invokespecial com.google.protobuf.ProtobufArrayList.<init>:([Ljava/lang/Object;I)V
         1: .line 58
            return
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/protobuf/ProtobufArrayList<TE;>;

  private void <init>(E[], );
    descriptor: ([Ljava/lang/Object;I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // java.lang.Object[] array
        start local 2 // int size
         0: .line 60
            aload 0 /* this */
            invokespecial com.google.protobuf.AbstractProtobufList.<init>:()V
         1: .line 61
            aload 0 /* this */
            aload 1 /* array */
            putfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
         2: .line 62
            aload 0 /* this */
            iload 2 /* size */
            putfield com.google.protobuf.ProtobufArrayList.size:I
         3: .line 63
            return
        end local 2 // int size
        end local 1 // java.lang.Object[] array
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    4     1  array  [Ljava/lang/Object;
            0    4     2   size  I
    Signature: ([TE;I)V
    MethodParameters:
       Name  Flags
      array  
      size   

  public com.google.protobuf.ProtobufArrayList<E> mutableCopyWithCapacity(int);
    descriptor: (I)Lcom/google/protobuf/ProtobufArrayList;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int capacity
         0: .line 67
            iload 1 /* capacity */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            if_icmpge 2
         1: .line 68
            new java.lang.IllegalArgumentException
            dup
            invokespecial java.lang.IllegalArgumentException.<init>:()V
            athrow
         2: .line 71
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* capacity */
            invokestatic java.util.Arrays.copyOf:([Ljava/lang/Object;I)[Ljava/lang/Object;
            astore 2 /* newArray */
        start local 2 // java.lang.Object[] newArray
         3: .line 73
            new com.google.protobuf.ProtobufArrayList
            dup
            aload 2 /* newArray */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            invokespecial com.google.protobuf.ProtobufArrayList.<init>:([Ljava/lang/Object;I)V
            areturn
        end local 2 // java.lang.Object[] newArray
        end local 1 // int capacity
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    4     1  capacity  I
            3    4     2  newArray  [Ljava/lang/Object;
    Signature: (I)Lcom/google/protobuf/ProtobufArrayList<TE;>;
    MethodParameters:
          Name  Flags
      capacity  

  public boolean add();
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // java.lang.Object element
         0: .line 78
            aload 0 /* this */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIsMutable:()V
         1: .line 80
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            arraylength
            if_icmpne 5
         2: .line 82
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iconst_3
            imul
            iconst_2
            idiv
            iconst_1
            iadd
            istore 2 /* length */
        start local 2 // int length
         3: .line 83
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 2 /* length */
            invokestatic java.util.Arrays.copyOf:([Ljava/lang/Object;I)[Ljava/lang/Object;
            astore 3 /* newArray */
        start local 3 // java.lang.Object[] newArray
         4: .line 85
            aload 0 /* this */
            aload 3 /* newArray */
            putfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
        end local 3 // java.lang.Object[] newArray
        end local 2 // int length
         5: .line 88
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.size:I
            dup_x1
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.size:I
            aload 1 /* element */
            aastore
         6: .line 89
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.modCount:I
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.modCount:I
         7: .line 91
            iconst_1
            ireturn
        end local 1 // java.lang.Object element
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    8     0      this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    8     1   element  TE;
            3    5     2    length  I
            4    5     3  newArray  [Ljava/lang/Object;
    Signature: (TE;)Z
    MethodParameters:
         Name  Flags
      element  

  public void add(int, );
    descriptor: (ILjava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=5, args_size=3
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
        start local 2 // java.lang.Object element
         0: .line 96
            aload 0 /* this */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIsMutable:()V
         1: .line 98
            iload 1 /* index */
            iflt 2
            iload 1 /* index */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            if_icmple 3
         2: .line 99
      StackMap locals:
      StackMap stack:
            new java.lang.IndexOutOfBoundsException
            dup
            aload 0 /* this */
            iload 1 /* index */
            invokevirtual com.google.protobuf.ProtobufArrayList.makeOutOfBoundsExceptionMessage:(I)Ljava/lang/String;
            invokespecial java.lang.IndexOutOfBoundsException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 102
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            arraylength
            if_icmpge 6
         4: .line 104
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            iconst_1
            iadd
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iload 1 /* index */
            isub
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         5: .line 105
            goto 11
         6: .line 107
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iconst_3
            imul
            iconst_2
            idiv
            iconst_1
            iadd
            istore 3 /* length */
        start local 3 // int length
         7: .line 108
            iload 3 /* length */
            invokestatic com.google.protobuf.ProtobufArrayList.createArray:(I)[Ljava/lang/Object;
            astore 4 /* newArray */
        start local 4 // java.lang.Object[] newArray
         8: .line 111
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iconst_0
            aload 4 /* newArray */
            iconst_0
            iload 1 /* index */
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         9: .line 114
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aload 4 /* newArray */
            iload 1 /* index */
            iconst_1
            iadd
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iload 1 /* index */
            isub
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        10: .line 115
            aload 0 /* this */
            aload 4 /* newArray */
            putfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
        end local 4 // java.lang.Object[] newArray
        end local 3 // int length
        11: .line 118
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aload 2 /* element */
            aastore
        12: .line 119
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.size:I
        13: .line 120
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.modCount:I
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.modCount:I
        14: .line 121
            return
        end local 2 // java.lang.Object element
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   15     0      this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0   15     1     index  I
            0   15     2   element  TE;
            7   11     3    length  I
            8   11     4  newArray  [Ljava/lang/Object;
    Signature: (ITE;)V
    MethodParameters:
         Name  Flags
      index    
      element  

  public E get();
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
         0: .line 125
            aload 0 /* this */
            iload 1 /* index */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIndexInRange:(I)V
         1: .line 126
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aaload
            areturn
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    2     1  index  I
    Signature: (I)TE;
    MethodParameters:
       Name  Flags
      index  

  public E remove();
    descriptor: (I)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=3, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
         0: .line 131
            aload 0 /* this */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIsMutable:()V
         1: .line 132
            aload 0 /* this */
            iload 1 /* index */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIndexInRange:(I)V
         2: .line 134
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aaload
            astore 2 /* value */
        start local 2 // java.lang.Object value
         3: .line 135
            iload 1 /* index */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iconst_1
            isub
            if_icmpge 5
         4: .line 136
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            iconst_1
            iadd
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iload 1 /* index */
            isub
            iconst_1
            isub
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         5: .line 139
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.size:I
            iconst_1
            isub
            putfield com.google.protobuf.ProtobufArrayList.size:I
         6: .line 140
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.modCount:I
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.modCount:I
         7: .line 141
            aload 2 /* value */
            areturn
        end local 2 // java.lang.Object value
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    8     0   this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    8     1  index  I
            3    8     2  value  TE;
    Signature: (I)TE;
    MethodParameters:
       Name  Flags
      index  

  public E set(int, );
    descriptor: (ILjava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
        start local 2 // java.lang.Object element
         0: .line 146
            aload 0 /* this */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIsMutable:()V
         1: .line 147
            aload 0 /* this */
            iload 1 /* index */
            invokevirtual com.google.protobuf.ProtobufArrayList.ensureIndexInRange:(I)V
         2: .line 149
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aaload
            astore 3 /* toReturn */
        start local 3 // java.lang.Object toReturn
         3: .line 150
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.array:[Ljava/lang/Object;
            iload 1 /* index */
            aload 2 /* element */
            aastore
         4: .line 152
            aload 0 /* this */
            dup
            getfield com.google.protobuf.ProtobufArrayList.modCount:I
            iconst_1
            iadd
            putfield com.google.protobuf.ProtobufArrayList.modCount:I
         5: .line 153
            aload 3 /* toReturn */
            areturn
        end local 3 // java.lang.Object toReturn
        end local 2 // java.lang.Object element
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    6     0      this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    6     1     index  I
            0    6     2   element  TE;
            3    6     3  toReturn  TE;
    Signature: (ITE;)TE;
    MethodParameters:
         Name  Flags
      index    
      element  

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.protobuf.ProtobufArrayList this
         0: .line 158
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            ireturn
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/protobuf/ProtobufArrayList<TE;>;

  private static <E> E[] createArray();
    descriptor: (I)[Ljava/lang/Object;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // int capacity
         0: .line 163
            iload 0 /* capacity */
            anewarray java.lang.Object
            areturn
        end local 0 // int capacity
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  capacity  I
    Signature: <E:Ljava/lang/Object;>(I)[TE;
    MethodParameters:
          Name  Flags
      capacity  

  private void ensureIndexInRange(int);
    descriptor: (I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
         0: .line 167
            iload 1 /* index */
            iflt 1
            iload 1 /* index */
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            if_icmplt 2
         1: .line 168
      StackMap locals:
      StackMap stack:
            new java.lang.IndexOutOfBoundsException
            dup
            aload 0 /* this */
            iload 1 /* index */
            invokevirtual com.google.protobuf.ProtobufArrayList.makeOutOfBoundsExceptionMessage:(I)Ljava/lang/String;
            invokespecial java.lang.IndexOutOfBoundsException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 170
      StackMap locals:
      StackMap stack:
            return
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    3     1  index  I
    MethodParameters:
       Name  Flags
      index  

  private java.lang.String makeOutOfBoundsExceptionMessage(int);
    descriptor: (I)Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.google.protobuf.ProtobufArrayList this
        start local 1 // int index
         0: .line 173
            new java.lang.StringBuilder
            dup
            ldc "Index:"
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* index */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc ", Size:"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield com.google.protobuf.ProtobufArrayList.size:I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 1 // int index
        end local 0 // com.google.protobuf.ProtobufArrayList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/google/protobuf/ProtobufArrayList<TE;>;
            0    1     1  index  I
    MethodParameters:
       Name  Flags
      index  

  public com.google.protobuf.Internal$ProtobufList mutableCopyWithCapacity(int);
    descriptor: (I)Lcom/google/protobuf/Internal$ProtobufList;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            iload 1
            invokevirtual com.google.protobuf.ProtobufArrayList.mutableCopyWithCapacity:(I)Lcom/google/protobuf/ProtobufArrayList;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Lcom/google/protobuf/AbstractProtobufList<TE;>;Ljava/util/RandomAccess;
SourceFile: "ProtobufArrayList.java"
InnerClasses:
  public abstract ProtobufList = com.google.protobuf.Internal$ProtobufList of com.google.protobuf.Internal