'\" t

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.\"

.\" Title: javap

.\" Language: English

.\" Date: 8 August 2014

.\" SectDesc: Basic Tools

.\" Software: JDK 8

.\" Arch: generic

.\" Part Number: E38207-03

.\"

.if n .pl 99999

.TH "javap" "1" "8 August 2014" "JDK 8" "Basic Tools"

.\" -----------------------------------------------------------------

.\" * Define some portability stuff

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.\" http://bugs.debian.org/507673

.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html

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.el       .ds Aq '

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.\" * set default formatting

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.nh

.\" disable justification (adjust text to left margin only)

.ad l

.\" -----------------------------------------------------------------

.\" * MAIN CONTENT STARTS HERE *

.\" -----------------------------------------------------------------

.SH "NAME"

javap \- Disassembles one or more class files\&.

.SH "SYNOPSIS"

.sp

.if n \{\

.RS 4

.\}

.nf

\fBjavap\fR [\fIoptions\fR] \fIclassfile\fR\&.\&.\&.

.fi

.if n \{\

.RE

.\}

.PP

\fIoptions\fR

.RS 4

The command\-line options\&. See Options\&.

.RE

.PP

\fIclassfile\fR

.RS 4

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

\fBfile:///home/user/myproject/src/DocFooter\&.class\fR\&.

.RE

.SH "DESCRIPTION"

.PP

The

\fBjavap\fR

command disassembles one or more class files\&. The output depends on the options used\&. When no options are used, then the

\fBjavap\fR

command prints the package, protected and public fields, and methods of the classes passed to it\&. The

\fBjavap\fR

command prints its output to

\fBstdout\fR\&.

.SH "OPTIONS"

.PP

\-help

.br

\-\-help

.br

\-?

.RS 4

Prints a help message for the

\fBjavap\fR

command\&.

.RE

.PP

\-version

.RS 4

Prints release information\&.

.RE

.PP

\-l

.RS 4

Prints line and local variable tables\&.

.RE

.PP

\-public

.RS 4

Shows only public classes and members\&.

.RE

.PP

\-protected

.RS 4

Shows only protected and public classes and members\&.

.RE

.PP

\-private

.br

\-p

.RS 4

Shows all classes and members\&.

.RE

.PP

\-J\fIoption\fR

.RS 4

Passes the specified option to the JVM\&. For example:

.sp

.if n \{\

.RS 4

.\}

.nf

\fBjavap \-J\-version\fR

\fBjavap \-J\-Djava\&.security\&.manager \-J\-Djava\&.security\&.policy=MyPolicy MyClassName\fR

.fi

.if n \{\

.RE

.\}

For more information about JVM options, see the command documentation\&.

.RE

.PP

\-s

.RS 4

Prints internal type signatures\&.

.RE

.PP

\-sysinfo

.RS 4

Shows system information (path, size, date, MD5 hash) of the class being processed\&.

.RE

.PP

\-constants

.RS 4

Shows

\fBstatic final\fR

constants\&.

.RE

.PP

\-c

.RS 4

Prints disassembled code, for example, the instructions that comprise the Java bytecodes, for each of the methods in the class\&.

.RE

.PP

\-verbose

.RS 4

Prints stack size, number of locals and arguments for methods\&.

.RE

.PP

\-classpath \fIpath\fR

.RS 4

Specifies the path the

\fBjavap\fR

command uses to look up classes\&. Overrides the default or the

\fBCLASSPATH\fR

environment variable when it is set\&.

.RE

.PP

\-bootclasspath \fIpath\fR

.RS 4

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

\fBjre/lib/rt\&.jar\fR

and several other JAR files\&.

.RE

.PP

\-extdir \fIdirs\fR

.RS 4

Overrides the location at which installed extensions are searched for\&. The default location for extensions is the value of

\fBjava\&.ext\&.dirs\fR\&.

.RE

.SH "EXAMPLE"

.PP

Compile the following

\fBDocFooter\fR

class:

.sp

.if n \{\

.RS 4

.\}

.nf

\fBimport java\&.awt\&.*;\fR

\fBimport java\&.applet\&.*;\fR

\fB \fR

\fBpublic class DocFooter extends Applet {\fR

\fB        String date;\fR

\fB        String email;\fR

\fB \fR

\fB        public void init() {\fR

\fB                resize(500,100);\fR

\fB                date = getParameter("LAST_UPDATED");\fR

\fB                email = getParameter("EMAIL");\fR

\fB        }\fR

\fB \fR

\fB        public void paint(Graphics g) {\fR

\fB                g\&.drawString(date + " by ",100, 15);\fR

\fB                g\&.drawString(email,290,15);\fR

\fB        }\fR

\fB}\fR

.fi

.if n \{\

.RE

.\}

.PP

The output from the

\fBjavap DocFooter\&.class\fR

command yields the following:

.sp

.if n \{\

.RS 4

.\}

.nf

\fBCompiled from "DocFooter\&.java"\fR

\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR

\fB  java\&.lang\&.String date;\fR

\fB  java\&.lang\&.String email;\fR

\fB  public DocFooter();\fR

\fB  public void init();\fR

\fB  public void paint(java\&.awt\&.Graphics);\fR

\fB}\fR

.fi

.if n \{\

.RE

.\}

.PP

The output from

\fBjavap \-c DocFooter\&.class\fR

command yields the following:

.sp

.if n \{\

.RS 4

.\}

.nf

\fBCompiled from "DocFooter\&.java"\fR

\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR

\fB  java\&.lang\&.String date;\fR

\fB  java\&.lang\&.String email;\fR

\fB  public DocFooter();\fR

\fB    Code:\fR

\fB       0: aload_0       \fR

\fB       1: invokespecial #1                  // Method\fR

\fBjava/applet/Applet\&."<init>":()V\fR

\fB       4: return        \fR

\fB  public void init();\fR

\fB    Code:\fR

\fB       0: aload_0       \fR

\fB       1: sipush        500\fR

\fB       4: bipush        100\fR

\fB       6: invokevirtual #2                  // Method resize:(II)V\fR

\fB       9: aload_0       \fR

\fB      10: aload_0       \fR

\fB      11: ldc           #3                  // String LAST_UPDATED\fR

\fB      13: invokevirtual #4                  // Method\fR

\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR

\fB      16: putfield      #5                  // Field date:Ljava/lang/String;\fR

\fB      19: aload_0       \fR

\fB      20: aload_0       \fR

\fB      21: ldc           #6                  // String EMAIL\fR

\fB      23: invokevirtual #4                  // Method\fR

\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR

\fB      26: putfield      #7                  // Field email:Ljava/lang/String;\fR

\fB      29: return        \fR

\fB  public void paint(java\&.awt\&.Graphics);\fR

\fB    Code:\fR

\fB       0: aload_1       \fR

\fB       1: new           #8                  // class java/lang/StringBuilder\fR

\fB       4: dup           \fR

\fB       5: invokespecial #9                  // Method\fR

\fB java/lang/StringBuilder\&."<init>":()V\fR

\fB       8: aload_0       \fR

\fB       9: getfield      #5                  // Field date:Ljava/lang/String;\fR

\fB      12: invokevirtual #10                 // Method\fR

\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR

\fB      15: ldc           #11                 // String  by \fR

\fB      17: invokevirtual #10                 // Method\fR

\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR

\fB      20: invokevirtual #12                 // Method\fR

\fB java/lang/StringBuilder\&.toString:()Ljava/lang/String;\fR

\fB      23: bipush        100\fR

\fB      25: bipush        15\fR

\fB      27: invokevirtual #13                 // Method\fR

\fB java/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR

\fB      30: aload_1       \fR

\fB      31: aload_0       \fR

\fB      32: getfield      #7                  // Field email:Ljava/lang/String;\fR

\fB      35: sipush        290\fR

\fB      38: bipush        15\fR

\fB      40: invokevirtual #13                 // Method\fR

\fBjava/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR

\fB      43: return        \fR

\fB}\fR

.fi

.if n \{\

.RE

.\}

.SH "SEE ALSO"

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

.el \{\

.sp -1

.IP \(bu 2.3

.\}

java(1)

.RE

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

.el \{\

.sp -1

.IP \(bu 2.3

.\}

javac(1)

.RE

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

.el \{\

.sp -1

.IP \(bu 2.3

.\}

javadoc(1)

.RE

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

.el \{\

.sp -1

.IP \(bu 2.3

.\}

jdb(1)

.RE

.sp

.RS 4

.ie n \{\

\h'-04'\(bu\h'+03'\c

.\}

.el \{\

.sp -1

.IP \(bu 2.3

.\}

jdeps(1)

.RE

.br

'pl 8.5i

'bp