jad

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jadとは、Javaのデコンパイラ(逆コンパイラ)です。JavaのclassファイルのバイトコードをJava言語に変換できます。

読み方

jad

じぇーえーでぃー

概要

jadは、Javaのクラスファイルをデコンパイルできます。

インストール

FreeBSD

$ sudo pkg install jad

Mac OS X

homebrewでjadをインストールできます。

$ sudo brew tap homebrew/binary
$ sudo brew install jad
$ brew untap homebrew/binary

Windows/Linux

http://varaneckas.com/jad/ からダウンロードします。

ソースコード

/*
 * hello.java
 * Copyright (C) 2015 kaoru <kaoru@localhost>
 */
public class hello
{
        public static void main(String[] args) {
                System.out.println("hello");
        }
}

コンパイル

javac hello.java

実行例

.jadという拡張子のファイルが作成されます。

$ jad hello.class
Parsing hello.class...The class file version is 52.0 (only 45.3, 46.0 and 47.0
are supported)
 Generating hello.jad

jadから得られたソースコード

// Decompiled by Jad v1.5.8c. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3)
// Source File Name:   hello.java
 
import java.io.PrintStream;
 
public class hello
{
 
    public hello()
    {
    }
 
    public static void main(String args[])
    {
        System.out.println("hello");
    }
}

コマンドラインオプション

Jad v1.5.8c. Copyright 2001 Pavel Kouznetsov (kpdus@yahoo.com).
Usage:    jad [option(s)] <filename(s)>
Options: -a       - generate JVM instructions as comments (annotate)
         -af      - output fully qualified names when annotating
         -b       - generate redundant braces (braces)
         -clear   - clear all prefixes, including the default ones
         -d <dir> - directory for output files
         -dead    - try to decompile dead parts of code (if there are any)
         -dis     - disassembler only (disassembler)
         -f       - generate fully qualified names (fullnames)
         -ff      - output fields before methods (fieldsfirst)
         -i       - print default initializers for fields (definits)
         -l<num>  - split strings into pieces of max <num> chars (splitstr)
         -lnc     - output original line numbers as comments (lnc)
         -lradix<num>- display long integers using the specified radix
         -nl      - split strings on newline characters (splitstr)
         -noconv  - don't convert Java identifiers into valid ones (noconv)
         -nocast  - don't generate auxiliary casts
         -noclass - don't convert .class operators
         -nocode  - don't generate the source code for methods
         -noctor  - suppress the empty constructors
         -nodos   - turn off check for class files written in DOS mode
         -noinner - turn off the support of inner classes
         -nolvt   - ignore Local Variable Table entries (nolvt)
         -nonlb   - don't insert a newline before opening brace (nonlb)
         -o       - overwrite output files without confirmation
         -p       - send all output to STDOUT (for piping)
         -pa <pfx>- prefix for all packages in generated source files
         -pc <pfx>- prefix for classes with numerical names (default: _cls)
         -pe <pfx>- prefix for unused exception names (default: _ex)
         -pf <pfx>- prefix for fields with numerical names (default: _fld)
         -pi<num> - pack imports into one line using .* (packimports)
         -pl <pfx>- prefix for locals with numerical names (default: _lcl)
         -pm <pfx>- prefix for methods with numerical names (default: _mth)
         -pp <pfx>- prefix for method parms with numerical names (default:_prm)
         -pv<num> - pack fields with the same types into one line (packfields)
         -r       - restore package directory structure
         -radix<num>- display integers using the specified radix (8, 10, or 16)
         -s <ext> - output file extension (default: .jad)
         -safe    - generate additional casts to disambiguate methods/fields
         -space   - output space between keyword (if, while, etc) and expression
         -stat    - show the total number of processed classes/methods/fields
         -t<num>  - use <num> spaces for indentation (default: 4)
         -t       - use tabs instead of spaces for indentation
         -v       - show method names while decompiling

関連項目

• Javaのデコンパイラ
• Androidアプリのapkファイルを解析する方法

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