| '\" 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" |
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| .\" * Define some portability stuff |
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| .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| .\" http://bugs.debian.org/507673 |
| .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html |
| .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| .ie \n(.g .ds Aq \(aq |
| .el .ds Aq ' |
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| .\" * set default formatting |
| .\" ----------------------------------------------------------------- |
| .\" disable hyphenation |
| .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 |
| .\} |
| javah(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 |