373 lines
8.3 KiB
Groff
373 lines
8.3 KiB
Groff
'\" t
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.\" Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
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.\"
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.\" Title: javap
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.\" Language: English
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.\" Date: 8 August 2014
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.\" SectDesc: Basic Tools
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.\" Software: JDK 8
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.\" Arch: generic
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.\" Part Number: E38209-03
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.\"
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.if n .pl 99999
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.TH "javap" "1" "8 August 2014" "JDK 8" "Basic Tools"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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javap \- Disassembles one or more class files\&.
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.SH "SYNOPSIS"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBjavap\fR [\fIoptions\fR] \fIclassfile\fR\&.\&.\&.
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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\fIoptions\fR
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.RS 4
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The command\-line options\&. See Options\&.
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.RE
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.PP
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\fIclassfile\fR
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.RS 4
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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
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\fBfile:///home/user/myproject/src/DocFooter\&.class\fR\&.
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.RE
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.SH "DESCRIPTION"
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.PP
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The
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\fBjavap\fR
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command disassembles one or more class files\&. The output depends on the options used\&. When no options are used, then the
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\fBjavap\fR
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command prints the package, protected and public fields, and methods of the classes passed to it\&. The
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\fBjavap\fR
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command prints its output to
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\fBstdout\fR\&.
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.SH "OPTIONS"
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.PP
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\-help
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.br
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\-\-help
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.br
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\-?
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.RS 4
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Prints a help message for the
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\fBjavap\fR
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command\&.
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.RE
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.PP
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\-version
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.RS 4
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Prints release information\&.
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.RE
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.PP
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\-l
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.RS 4
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Prints line and local variable tables\&.
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.RE
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.PP
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\-public
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.RS 4
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Shows only public classes and members\&.
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.RE
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.PP
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\-protected
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.RS 4
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Shows only protected and public classes and members\&.
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.RE
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.PP
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\-private
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.br
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\-p
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.RS 4
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Shows all classes and members\&.
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.RE
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.PP
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\-J\fIoption\fR
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.RS 4
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Passes the specified option to the JVM\&. For example:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBjavap \-J\-version\fR
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\fBjavap \-J\-Djava\&.security\&.manager \-J\-Djava\&.security\&.policy=MyPolicy MyClassName\fR
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.fi
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.if n \{\
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.RE
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.\}
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For more information about JVM options, see the command documentation\&.
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.RE
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.PP
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\-s
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.RS 4
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Prints internal type signatures\&.
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.RE
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.PP
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\-sysinfo
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.RS 4
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Shows system information (path, size, date, MD5 hash) of the class being processed\&.
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.RE
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.PP
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\-constants
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.RS 4
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Shows
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\fBstatic final\fR
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constants\&.
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.RE
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.PP
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\-c
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.RS 4
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Prints disassembled code, for example, the instructions that comprise the Java bytecodes, for each of the methods in the class\&.
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.RE
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.PP
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\-verbose
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.RS 4
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Prints stack size, number of locals and arguments for methods\&.
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.RE
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.PP
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\-classpath \fIpath\fR
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.RS 4
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Specifies the path the
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\fBjavap\fR
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command uses to look up classes\&. Overrides the default or the
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\fBCLASSPATH\fR
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environment variable when it is set\&.
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.RE
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.PP
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\-bootclasspath \fIpath\fR
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.RS 4
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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
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\fBjre/lib/rt\&.jar\fR
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and several other JAR files\&.
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.RE
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.PP
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\-extdir \fIdirs\fR
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.RS 4
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Overrides the location at which installed extensions are searched for\&. The default location for extensions is the value of
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\fBjava\&.ext\&.dirs\fR\&.
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.RE
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.SH "EXAMPLE"
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.PP
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Compile the following
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\fBDocFooter\fR
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class:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBimport java\&.awt\&.*;\fR
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\fBimport java\&.applet\&.*;\fR
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\fB \fR
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\fBpublic class DocFooter extends Applet {\fR
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\fB String date;\fR
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\fB String email;\fR
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\fB \fR
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\fB public void init() {\fR
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\fB resize(500,100);\fR
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\fB date = getParameter("LAST_UPDATED");\fR
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\fB email = getParameter("EMAIL");\fR
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\fB }\fR
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\fB \fR
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\fB public void paint(Graphics g) {\fR
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\fB g\&.drawString(date + " by ",100, 15);\fR
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\fB g\&.drawString(email,290,15);\fR
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\fB }\fR
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\fB}\fR
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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The output from the
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\fBjavap DocFooter\&.class\fR
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command yields the following:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBCompiled from "DocFooter\&.java"\fR
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\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR
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\fB java\&.lang\&.String date;\fR
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\fB java\&.lang\&.String email;\fR
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\fB public DocFooter();\fR
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\fB public void init();\fR
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\fB public void paint(java\&.awt\&.Graphics);\fR
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\fB}\fR
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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The output from
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\fBjavap \-c DocFooter\&.class\fR
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command yields the following:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBCompiled from "DocFooter\&.java"\fR
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\fBpublic class DocFooter extends java\&.applet\&.Applet {\fR
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\fB java\&.lang\&.String date;\fR
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\fB java\&.lang\&.String email;\fR
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\fB public DocFooter();\fR
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\fB Code:\fR
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\fB 0: aload_0 \fR
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\fB 1: invokespecial #1 // Method\fR
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\fBjava/applet/Applet\&."<init>":()V\fR
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\fB 4: return \fR
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\fB public void init();\fR
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\fB Code:\fR
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\fB 0: aload_0 \fR
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\fB 1: sipush 500\fR
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\fB 4: bipush 100\fR
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\fB 6: invokevirtual #2 // Method resize:(II)V\fR
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\fB 9: aload_0 \fR
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\fB 10: aload_0 \fR
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\fB 11: ldc #3 // String LAST_UPDATED\fR
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\fB 13: invokevirtual #4 // Method\fR
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\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR
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\fB 16: putfield #5 // Field date:Ljava/lang/String;\fR
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\fB 19: aload_0 \fR
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\fB 20: aload_0 \fR
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\fB 21: ldc #6 // String EMAIL\fR
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\fB 23: invokevirtual #4 // Method\fR
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\fB getParameter:(Ljava/lang/String;)Ljava/lang/String;\fR
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\fB 26: putfield #7 // Field email:Ljava/lang/String;\fR
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\fB 29: return \fR
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\fB public void paint(java\&.awt\&.Graphics);\fR
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\fB Code:\fR
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\fB 0: aload_1 \fR
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\fB 1: new #8 // class java/lang/StringBuilder\fR
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\fB 4: dup \fR
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\fB 5: invokespecial #9 // Method\fR
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\fB java/lang/StringBuilder\&."<init>":()V\fR
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\fB 8: aload_0 \fR
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\fB 9: getfield #5 // Field date:Ljava/lang/String;\fR
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\fB 12: invokevirtual #10 // Method\fR
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\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR
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\fB 15: ldc #11 // String by \fR
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\fB 17: invokevirtual #10 // Method\fR
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\fB java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fR
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\fB 20: invokevirtual #12 // Method\fR
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\fB java/lang/StringBuilder\&.toString:()Ljava/lang/String;\fR
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\fB 23: bipush 100\fR
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\fB 25: bipush 15\fR
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\fB 27: invokevirtual #13 // Method\fR
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\fB java/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR
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\fB 30: aload_1 \fR
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\fB 31: aload_0 \fR
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\fB 32: getfield #7 // Field email:Ljava/lang/String;\fR
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\fB 35: sipush 290\fR
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\fB 38: bipush 15\fR
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\fB 40: invokevirtual #13 // Method\fR
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\fBjava/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fR
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\fB 43: return \fR
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\fB}\fR
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.fi
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.if n \{\
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.RE
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.\}
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.SH "SEE ALSO"
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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java(1)
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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javac(1)
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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javadoc(1)
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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javah(1)
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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jdb(1)
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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jdeps(1)
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.RE
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.br
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'pl 8.5i
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'bp
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