# phpman > man > javap(1) > **TLDR:** Disassemble class files and list them. > - Disassemble and list one or more `.class` files: `javap {{path/to/file1.class path/to/file2.class ...}}` - Disassemble and list a built-in class file: `javap java.{{package}}.{{class}}` - Display help: `javap -help` - Display version: `javap -version` *Source: tldr-pages* --- [javap(1)](https://www.chedong.com/phpMan.php/man/javap/1/markdown) Basic Tools [javap(1)](https://www.chedong.com/phpMan.php/man/javap/1/markdown) ## NAME javap - Disassembles one or more class files. ## SYNOPSIS **javap** [_options_] _classfile_... _options_ The command-line options. See Options. _classfile_ One or more classes separated by spaces to be processed for annotations such as DocFooter.class. You can specify a class that can be found in the class path, by its file name or with a URL such as **file:///home/user/myproject/src/DocFooter.class**. ## DESCRIPTION The **javap** command disassembles one or more class files. The output depends on the options used. When no options are used, then the **javap** command prints the package, protected and public fields, and methods of the classes passed to it. The **javap** command prints its output to **stdout**. ## OPTIONS ### -help ### --help -? Prints a help message for the **javap** command. ### -version Prints release information. ### -l Prints line and local variable tables. ### -public Shows only public classes and members. ### -protected Shows only protected and public classes and members. ### -private ### -p Shows all classes and members. ### -J_option_ Passes the specified option to the JVM. For example: **javap** **-J-version** **javap** **-J-Djava.security.manager** **-J-Djava.security.policy=MyPolicy** **MyClassName** For more information about JVM options, see the command documentation. ### -s Prints internal type signatures. ### -sysinfo Shows system information (path, size, date, MD5 hash) of the class being processed. ### -constants Shows **static** **final** constants. ### -c Prints disassembled code, for example, the instructions that comprise the Java bytecodes, for each of the methods in the class. ### -verbose Prints stack size, number of locals and arguments for methods. -classpath _path_ Specifies the path the **javap** command uses to look up classes. Overrides the default or the **CLASSPATH** environment variable when it is set. -bootclasspath _path_ Specifies the path from which to load bootstrap classes. By default, the bootstrap classes are the classes that implement the core Java platform located in **jre/lib/rt.jar** and several other JAR files. -extdir _dirs_ Overrides the location at which installed extensions are searched for. The default location for extensions is the value of **java.ext.dirs**. ## EXAMPLE Compile the following **DocFooter** class: **import** **java.awt.*;** **import** **java.applet.*;** **public** **class** **DocFooter** **extends** **Applet** **{** **String** **date;** **String** **email;** **public** **void** **init()** **{** **resize(500,100);** **date** **=** **getParameter("LAST**___**UPDATED");** **email** **=** **getParameter("EMAIL");** **}** **public** **void** **paint(Graphics** **g)** **{** **g.drawString(date** **+** **"** **by** **",100,** **15);** **g.drawString(email,290,15);** **}** **}** The output from the **javap** **DocFooter.class** command yields the following: **Compiled** **from** **"DocFooter.java"** **public** **class** **DocFooter** **extends** **java.applet.Applet** **{** **java.lang.String** **date;** **java.lang.String** **email;** **public** **DocFooter();** **public** **void** **init();** **public** **void** **paint(java.awt.Graphics);** **}** The output from **javap** **-c** **DocFooter.class** command yields the following: **Compiled** **from** **"DocFooter.java"** **public** **class** **DocFooter** **extends** **java.applet.Applet** **{** **java.lang.String** **date;** **java.lang.String** **email;** **public** **DocFooter();** **Code:** **0:** **aload**___**0** **1:** **invokespecial** **#1** **//** **Method** **java/applet/Applet."":()V** **4:** **return** **public** **void** **init();** **Code:** **0:** **aload**___**0** **1:** **sipush** **500** **4:** **bipush** **100** **6:** **invokevirtual** **#2** **//** **Method** **resize:(II)V** **9:** **aload**___**0** **10:** **aload**___**0** **11:** **ldc** **#3** **//** **String** **LAST**___**UPDATED** **13:** **invokevirtual** **#4** **//** **Method** **getParameter:(Ljava/lang/String;)Ljava/lang/String;** **16:** **putfield** **#5** **//** **Field** **date:Ljava/lang/String;** **19:** **aload**___**0** **20:** **aload**___**0** **21:** **ldc** **#6** **//** **String** **EMAIL** **23:** **invokevirtual** **#4** **//** **Method** **getParameter:(Ljava/lang/String;)Ljava/lang/String;** **26:** **putfield** **#7** **//** **Field** **email:Ljava/lang/String;** **29:** **return** **public** **void** **paint(java.awt.Graphics);** **Code:** **0:** **aload**___**1** **1:** **new** **#8** **//** **class** **java/lang/StringBuilder** **4:** **dup** **5:** **invokespecial** **#9** **//** **Method** **java/lang/StringBuilder."":()V** **8:** **aload**___**0** **9:** **getfield** **#5** **//** **Field** **date:Ljava/lang/String;** **12:** **invokevirtual** **#10** **//** **Method** **java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;** **15:** **ldc** **#11** **//** **String** **by** **17:** **invokevirtual** **#10** **//** **Method** **java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;** **20:** **invokevirtual** **#12** **//** **Method** **java/lang/StringBuilder.toString:()Ljava/lang/String;** **23:** **bipush** **100** **25:** **bipush** **15** **27:** **invokevirtual** **#13** **//** **Method** **java/awt/Graphics.drawString:(Ljava/lang/String;II)V** **30:** **aload**___**1** **31:** **aload**___**0** **32:** **getfield** **#7** **//** **Field** **email:Ljava/lang/String;** **35:** **sipush** **290** **38:** **bipush** **15** **40:** **invokevirtual** **#13** **//** **Method** **java/awt/Graphics.drawString:(Ljava/lang/String;II)V** **43:** **return** **}** ## SEE ALSO • [java(1)](https://www.chedong.com/phpMan.php/man/java/1/markdown) • [javac(1)](https://www.chedong.com/phpMan.php/man/javac/1/markdown) • [javadoc(1)](https://www.chedong.com/phpMan.php/man/javadoc/1/markdown) • [javah(1)](https://www.chedong.com/phpMan.php/man/javah/1/markdown) • [jdb(1)](https://www.chedong.com/phpMan.php/man/jdb/1/markdown) • [jdeps(1)](https://www.chedong.com/phpMan.php/man/jdeps/1/markdown) JDK 8 8 August 2014 [javap(1)](https://www.chedong.com/phpMan.php/man/javap/1/markdown)