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| .\" Arch: generic |
| .\" Software: JDK 8 |
| .\" Date: 21 November 2013 |
| .\" SectDesc: Basic Tools |
| .\" Title: javap.1 |
| .\" |
| .if n .pl 99999 |
| .TH javap 1 "21 November 2013" "JDK 8" "Basic Tools" |
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| .\" * MAIN CONTENT STARTS HERE *
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| |
| .SH NAME |
| javap \- Disassembles one or more class files\&. |
| .SH SYNOPSIS |
| .sp |
| .nf |
| |
| \fBjavap\fR [\fIoptions\fR] \fIclassfile\fR\&.\&.\&. |
| .fi |
| .sp |
| .TP |
| \fIoptions\fR |
| The command-line options\&. See Options\&. |
| .TP |
| \fIclassfile\fR |
| 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 \f3file:///home/user/myproject/src/DocFooter\&.class\fR\&. |
| .SH DESCRIPTION |
| The \f3javap\fR command disassembles one or more class files\&. The output depends on the options used\&. When no options are used, then the \f3javap\fR command prints the package, protected and public fields, and methods of the classes passed to it\&. The \f3javap\fR command prints its output to \f3stdout\fR\&. |
| .SH OPTIONS |
| .TP |
| -help, --help, -? |
| .br |
| Prints a help message for the \f3javap\fR command\&. |
| .TP |
| -version |
| .br |
| Prints release information\&. |
| .TP |
| -l |
| .br |
| Prints line and local variable tables\&. |
| .TP |
| -public |
| .br |
| Shows only public classes and members\&. |
| .TP |
| -protected |
| .br |
| Shows only protected and public classes and members\&. |
| .TP |
| -private, -p |
| .br |
| Shows all classes and members\&. |
| .TP |
| -J\fIoption\fR |
| .br |
| Passes the specified option to the JVM\&. For example: |
| .sp |
| .nf |
| \f3javap \-J\-version\fP |
| .fi |
| .nf |
| \f3javap \-J\-Djava\&.security\&.manager \-J\-Djava\&.security\&.policy=MyPolicy MyClassName\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .sp |
| |
| |
| For more information about JVM options, see the \f3java(1)\fR command documentation\&. |
| .TP |
| -s |
| .br |
| Prints internal type signatures\&. |
| .TP |
| -sysinfo |
| .br |
| Shows system information (path, size, date, MD5 hash) of the class being processed\&. |
| .TP |
| -constants |
| .br |
| Shows \f3static final\fR constants\&. |
| .TP |
| -c |
| .br |
| Prints disassembled code, for example, the instructions that comprise the Java bytecodes, for each of the methods in the class\&. |
| .TP |
| -verbose |
| .br |
| Prints stack size, number of locals and arguments for methods\&. |
| .TP |
| -classpath \fIpath\fR |
| .br |
| Specifies the path the \f3javap\fR command uses to look up classes\&. Overrides the default or the \f3CLASSPATH\fR environment variable when it is set\&. |
| .TP |
| -bootclasspath \fIpath\fR |
| .br |
| 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 \f3jre/lib/rt\&.jar\fR and several other JAR files\&. |
| .TP |
| -extdir \fIdirs\fR |
| .br |
| Overrides the location at which installed extensions are searched for\&. The default location for extensions is the value of \f3java\&.ext\&.dirs\fR\&. |
| .SH EXAMPLE |
| Compile the following \f3DocFooter\fR class: |
| .sp |
| .nf |
| \f3import java\&.awt\&.*;\fP |
| .fi |
| .nf |
| \f3import java\&.applet\&.*;\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3public class DocFooter extends Applet {\fP |
| .fi |
| .nf |
| \f3 String date;\fP |
| .fi |
| .nf |
| \f3 String email;\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3 public void init() {\fP |
| .fi |
| .nf |
| \f3 resize(500,100);\fP |
| .fi |
| .nf |
| \f3 date = getParameter("LAST_UPDATED");\fP |
| .fi |
| .nf |
| \f3 email = getParameter("EMAIL");\fP |
| .fi |
| .nf |
| \f3 }\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3 public void paint(Graphics g) {\fP |
| .fi |
| .nf |
| \f3 g\&.drawString(date + " by ",100, 15);\fP |
| .fi |
| .nf |
| \f3 g\&.drawString(email,290,15);\fP |
| .fi |
| .nf |
| \f3 }\fP |
| .fi |
| .nf |
| \f3}\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .sp |
| The output from the \f3javap DocFooter\&.class\fR command yields the following: |
| .sp |
| .nf |
| \f3Compiled from "DocFooter\&.java"\fP |
| .fi |
| .nf |
| \f3public class DocFooter extends java\&.applet\&.Applet {\fP |
| .fi |
| .nf |
| \f3 java\&.lang\&.String date;\fP |
| .fi |
| .nf |
| \f3 java\&.lang\&.String email;\fP |
| .fi |
| .nf |
| \f3 public DocFooter();\fP |
| .fi |
| .nf |
| \f3 public void init();\fP |
| .fi |
| .nf |
| \f3 public void paint(java\&.awt\&.Graphics);\fP |
| .fi |
| .nf |
| \f3}\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .sp |
| The output from \f3javap -c DocFooter\&.class\fR command yields the following: |
| .sp |
| .nf |
| \f3Compiled from "DocFooter\&.java"\fP |
| .fi |
| .nf |
| \f3public class DocFooter extends java\&.applet\&.Applet {\fP |
| .fi |
| .nf |
| \f3 java\&.lang\&.String date;\fP |
| .fi |
| .nf |
| \f3 java\&.lang\&.String email;\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3 public DocFooter();\fP |
| .fi |
| .nf |
| \f3 Code:\fP |
| .fi |
| .nf |
| \f3 0: aload_0 \fP |
| .fi |
| .nf |
| \f3 1: invokespecial #1 // Method\fP |
| .fi |
| .nf |
| \f3java/applet/Applet\&."<init>":()V\fP |
| .fi |
| .nf |
| \f3 4: return \fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3 public void init();\fP |
| .fi |
| .nf |
| \f3 Code:\fP |
| .fi |
| .nf |
| \f3 0: aload_0 \fP |
| .fi |
| .nf |
| \f3 1: sipush 500\fP |
| .fi |
| .nf |
| \f3 4: bipush 100\fP |
| .fi |
| .nf |
| \f3 6: invokevirtual #2 // Method resize:(II)V\fP |
| .fi |
| .nf |
| \f3 9: aload_0 \fP |
| .fi |
| .nf |
| \f3 10: aload_0 \fP |
| .fi |
| .nf |
| \f3 11: ldc #3 // String LAST_UPDATED\fP |
| .fi |
| .nf |
| \f3 13: invokevirtual #4 // Method\fP |
| .fi |
| .nf |
| \f3 getParameter:(Ljava/lang/String;)Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 16: putfield #5 // Field date:Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 19: aload_0 \fP |
| .fi |
| .nf |
| \f3 20: aload_0 \fP |
| .fi |
| .nf |
| \f3 21: ldc #6 // String EMAIL\fP |
| .fi |
| .nf |
| \f3 23: invokevirtual #4 // Method\fP |
| .fi |
| .nf |
| \f3 getParameter:(Ljava/lang/String;)Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 26: putfield #7 // Field email:Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 29: return \fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .nf |
| \f3 public void paint(java\&.awt\&.Graphics);\fP |
| .fi |
| .nf |
| \f3 Code:\fP |
| .fi |
| .nf |
| \f3 0: aload_1 \fP |
| .fi |
| .nf |
| \f3 1: new #8 // class java/lang/StringBuilder\fP |
| .fi |
| .nf |
| \f3 4: dup \fP |
| .fi |
| .nf |
| \f3 5: invokespecial #9 // Method\fP |
| .fi |
| .nf |
| \f3 java/lang/StringBuilder\&."<init>":()V\fP |
| .fi |
| .nf |
| \f3 8: aload_0 \fP |
| .fi |
| .nf |
| \f3 9: getfield #5 // Field date:Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 12: invokevirtual #10 // Method\fP |
| .fi |
| .nf |
| \f3 java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fP |
| .fi |
| .nf |
| \f3 15: ldc #11 // String by \fP |
| .fi |
| .nf |
| \f3 17: invokevirtual #10 // Method\fP |
| .fi |
| .nf |
| \f3 java/lang/StringBuilder\&.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;\fP |
| .fi |
| .nf |
| \f3 20: invokevirtual #12 // Method\fP |
| .fi |
| .nf |
| \f3 java/lang/StringBuilder\&.toString:()Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 23: bipush 100\fP |
| .fi |
| .nf |
| \f3 25: bipush 15\fP |
| .fi |
| .nf |
| \f3 27: invokevirtual #13 // Method\fP |
| .fi |
| .nf |
| \f3 java/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fP |
| .fi |
| .nf |
| \f3 30: aload_1 \fP |
| .fi |
| .nf |
| \f3 31: aload_0 \fP |
| .fi |
| .nf |
| \f3 32: getfield #7 // Field email:Ljava/lang/String;\fP |
| .fi |
| .nf |
| \f3 35: sipush 290\fP |
| .fi |
| .nf |
| \f3 38: bipush 15\fP |
| .fi |
| .nf |
| \f3 40: invokevirtual #13 // Method\fP |
| .fi |
| .nf |
| \f3java/awt/Graphics\&.drawString:(Ljava/lang/String;II)V\fP |
| .fi |
| .nf |
| \f3 43: return \fP |
| .fi |
| .nf |
| \f3}\fP |
| .fi |
| .nf |
| \f3\fP |
| .fi |
| .sp |
| .SH SEE\ ALSO |
| .TP 0.2i |
| \(bu |
| javac(1) |
| .TP 0.2i |
| \(bu |
| java(1) |
| .TP 0.2i |
| \(bu |
| jdb(1) |
| .TP 0.2i |
| \(bu |
| javah(1) |
| .TP 0.2i |
| \(bu |
| javadoc(1) |
| .RE
|
| .br
|
| 'pl 8.5i
|
| 'bp
|