Javaクラスファイルで Hello, World

Hello World memo

- magic
CAFEBABE

- minor_virsion
0000

- major_version
0034

- constant_pool_count
(25 + 1)
001A

- constant_pool
#1    = Utf8         Hello
  01 0005 48656C6C6F
  01000548656C6C6F

#2    = Class        #1
  07 0001
  070001

#3    = Utf8         java/lang/Object
  01 0010 6A6176612F6C616E672F4F626A656374
  0100106A6176612F6C616E672F4F626A656374

#4    = Class        #3
  07 0003
  070003

#5    = Utf8         java/lang/System
  01 0010 6A6176612F6C616E672F53797374656D
  0100106A6176612F6C616E672F53797374656D

#6    = Class        #5
  07 0005
  070005

#7    = Utf8         java/io/PrintStream
  01 0013 6A6176612F696F2F5072696E7453747265616D
  0100136A6176612F696F2F5072696E7453747265616D

#8    = Class        #7
  07 0007
  070007

#9    = Utf8         out
  01 0003 6F7574
  0100036F7574

#10   = Utf8         Ljava/io/PrintStream;
  01 0015 4C6A6176612F696F2F5072696E7453747265616D3B
  0100154C6A6176612F696F2F5072696E7453747265616D3B

#11   = NameAndType  #9:#10
  0C 0009 000A
  0C0009000A

#12   = Fieldref     #8.#11
  09 0006 000B
  090006000B

#13   = Utf8         println
  01 0007 7072696E746C6E
  0100077072696E746C6E

#14   = UTf8         (Ljava/lang/String;)V
  01 0015 284C6A6176612F6C616E672F537472696E673B2956
  010015284C6A6176612F6C616E672F537472696E673B2956

#15   = NameAndType  #13:#14
  0C 000D 000E
  0C000D000E

#16   = Methodref    #8.#15
  0A 0008 000F
  0A0008000F

#17   = Utf8         <init>
  01 0006 3C696E69743E
  0100063C696E69743E

#18   = Utf8         ()V
  01 0003 282956
  010003282956

#19   = NameAndType  #17:#18
  0C 0011 0012
  0C00110012

#20   = Methodref    #3.#19
  0A 0004 0013
  0A00040013

#21   = Utf8         Hello, World
  01 000C 48656C6C6F2C20576F726C64
  01000C48656C6C6F2C20576F726C64

#22   = String       #21
  08 0015
  080015

#23   = Utf8         Code
  01 0004 436F6465
  010004436F6465

#24   = Utf8         main
  01 0004 6D61696E
  0100046D61696E

#25   = Utf8         ([Ljava/lang/String;)V
  01 0016 285B4C6A6176612F6C616E672F537472696E673B2956
  010016285B4C6A6176612F6C616E672F537472696E673B2956

- access_flags
0020

- this_class
0002

- super_class
0004

- interfaces_count
0000

- interfaces
なし

- fields_count
0000

- fields
なし

- methods_count
0002

- methods

  - デフォルトコンストラクタ
    - access_flags
    0000

    - name_index
    0011

    - descriptor_index
    0012

    - attributes_count
    0001

    - attributes
     - Code
       - attribute_name_index
       0017

       - attribute_length
       00000011

       - max_stack 2
       0001

       - max_locals 2
       0001

       - code_length 4
       00000005

       - code 5
       2ab70014b1

       - exception_table_length 2
       0000

       - attributes_count 2
       0000

  - main関数
  - access_flags
  0009 (ACC_PUBLIC, ACC_STATIC)

  - name_index
  0018

  - descriptor_index
  0019

  - attributes_count
  0001

  - attributes
   - Code
     - attribute_name_index
     0017

     - attribute_length
     00000015

     - max_stack 2
     0002

     - max_locals 2
     0001

     - code_length 4
     00000009

     - code 9
     b2000c1216b60010b1

     - exception_table_length 2
     0000

     - attributes_count 2
     0000

- attributes_count
0000