JAD Java Decompiler Download Mirror

As http://www.kpdus.com is no longer accessible, JAD Java Decompiler download is extremely hard to find. Here is a mirror where you can get JAD for various platforms.

How to install JAD Java Decompiler

Unzip jad.zip file into any appropriate directory on your hard drive.
This will create two files:

  • an executable file named 'jad.exe' (Windows 9x/NT/2000) or 'jad' (UNIX)
  • README file 'Readme.txt', which contains the short user's manual

For UNIX users: make 'jad' executable: chmod a+x jad
No further setup is required.

How to decompile Java class using JAD Java Decompiler

To decompile a single JAVA class file 'example1.class'
type the following:

jad example1.class

This command creates file 'example1.jad' in the current directory.
If such file already exists Jad asks whether you want to overwrite it or not.
Option -o permits overwriting without a confirmation.

You can omit .class extension and/or use wildcards in the names of
input files.

Option -s  allows to change output file extension:

  jad -sjava example1.class

  This command creates file 'example1.java'. Be careful when using
  options -o and -sjava together, because Jad can accidentally overwrite
  your own source files.

  Jad uses JAVA class name as an output file name. For example, if class
  file 'example1.class' contains JAVA class 'test1' then Jad will create
  file 'test1.jad' rather than 'example1.jad'. If you want to specify
  your own output file name use the output redirection:

  jad -p example1.class > myexm1.java

  Option -d allows you to specify another directory for output files,
  which are created, by default, in the current directory. For example:

  jad -o -dtest -sjava *.class

  (or jad -o -d test -s java *.class, which has the same effect)

  This command decompiles all .class files in the current directory
  and places all output files with extension .java into directory 'test'.


  If you want to decompile the whole tree of JAVA classes,
  use the following command:

  jad -o -r -sjava -dsrc tree/**/*.class

  This command decompiles all .class files located in all
  subdirectories of 'tree' and creates output files in subdirectories
  of 'src' according to package names of classes. For example, if file
  'tree/a/b/c.class' contains class 'c' from package 'a.b', then
  output file will have a name 'src/a/b/c.java'.

  Note the use of the "two stars" wildcard ('**') in the previous
  command. It is handled by Jad rather than the command shell, so on
  UNIX the last argument should be single-quoted:

  jad -o -r -sjava -dsrc 'tree/**/*.class'


  In a case you want to check the accuracy of the decompilation or just
  curious, there is an option -a which tells Jad to annotate the output
  with JAVA Virtual Machine bytecodes.

  Jad supports the inner and anonymous classes.
  When Jad expands wildcards in the input file names,
  it automatically skips matching inner classes.
  On UNIX Jad skips inner classes if there is more than
  one class specified in the command line.
  Jad looks for inner classes in the directory of their top-level
  container class.
      

JAD Java Decompiler command line options

Jad accepts the following options:

-a       - annotate the output with JVM bytecodes (default: off)
-af      - same as -a, but output fully qualified names when annotating
-clear   - clear all prefixes, including the default ones (can be abbreviated as -cl)
-b       - output redundant braces (e.g., if(a) { b(); }, default: off)
-d
 - directory for output files (will be created when necessary)
  -dead    - try to decompile dead parts of code (if any) (default: off)
  -disass  - disassemble method bytecodes (no JAVA source generated)
  -f       - output fully qualified names for classes/fields/methods (default: off)
  -ff      - output class fields before methods (default: after methods)
  -i       - output default initializers for all non-final fields
  -l  - split strings into pieces of maximum  chars (default: off)
  -lnc     - annotate the output with line numbers (default: off)
  -lradix - display long integers using the specified radix (8, 10 or 16)
  -nl      - split strings on newline character (default: off)
  -nocast  - don't generate auxiliary casts
  -nocode  - don't generate the source code for methods
  -noconv  - don't convert Java identifiers (default: convert)
  -noctor  - suppress the empty constructors
  -nodos   - do not check for class files written in DOS mode (CR before NL, default: check)
  -nofd    - don't disambiguate fields with the same names by adding signatures to their names (default: do)
  -noinner - turn off the support of inner classes (default: on)
  -nolvt   - ignore Local Variable Table information
  -nonlb   - don't output a newline before opening brace (default: do)
  -o       - overwrite output files without confirmation (default: off)
  -p       - send decompiled code to STDOUT (e.g., for piping)
  -pi - pack imports into one line after  imports (default: 3)
  -pv - pack fields with identical types into one line (default: off)
  -pa - prefix for all packages in generated source files
  -pc - prefix for classes with numerical names (default: _cls)
  -pf - prefix for fields with numerical names (default: _fld)
  -pe - prefix for unused exception names (default: _ex)
  -pl - prefix for locals with numerical names (default: _lcl)
  -pm - prefix for methods with numerical names (default: _mth)
  -pp - prefix for method parms with numerical names (default: _prm)
  -r       - restore package directory structrure
  -radix - display integers using the specified radix (8, 10 or 16)
  -s  - output file extension (by default '.jad')
  -safe    - generate additional casts to disambiguate methods/fields (default: off)
  -space   - output space between keyword (if/for/while/etc) and expression (default: off)
  -stat    - display the total number of processed classes/methods/fields
  -t       - use tabs instead of spaces for indentation
  -t  - use  spaces for indentation (default: 4)
  -v       - display method names being decompiled
  -8       - convert UNICODE strings into 8-bit strings
  using the current ANSI code page (Win32 only)
  -&       - redirect STDERR to STDOUT (Win32 only)

Disclaimer

JAD is Copyright 1997-2001 Pavel Kouznetsov.

All rights reserved.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE IN ON-LINE CONTROL OF AIRCRAFT, AIR TRAFFIC, AIRCRAFT NAVIGATION OR AIRCRAFT COMMUNICATIONS; OR IN THE DESIGN, CONSTRUCTION, OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE AUTHOR DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OFFITNESS FOR SUCH USES. YOU MUST REPRESENT AND WARRANT THAT YOU WILL NOT USE THE SOFTWARE FOR SUCH PURPOSES

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