javap

 

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 User Commands                                            javap(1)
 


NAME
      javap - Java class file disassembler
 


SYNOPSIS
      javap [ -b ] 
            [ -c ] 
            [ -classpathpath ] 
            [ -h ] 
            [ -J flag ]
            [ -l ] 
            [ -package ] 
            [ -private ] 
            [ -protected ]
            [ -public ] 
            [ -s ] 
            [ -verbose ] 
            [ -verify ]
            [ -version ] 
            class . . .
 


DESCRIPTION
      The javap  command  disassembles  a  Java  class  file.  The
      options determine the output.  If no options are used, javap
      displays the public fields and methods of the classes passed
      to  it.   The  javap  command displays its output to stdout.
      For example, compile the following class declaration:
 
           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 javap DocFooter yields:
 
           Compiled from DocFooter.java
           public class DocFooter extends java.applet.Applet {
                java.lang.String date;
                java.lang.String email;
                public void init();
                public void paint(java.awt.Graphics);
                public DocFooter();
           }
 
 


OPTIONS
      The following options are supported.
 
      -b             Ensures backward compatibility with javap  in
                     JDK 1.1.
 
      -c             Prints out disassembled code,  that  is,  the
                     instructions    that    comprise   the   Java
                     bytecodes, for each of  the  methods  in  the
                     class.
 
      -classpathpath Specifies the path  javap  uses  to  look  up
                     classes.    Overrides   the  default  or  the
                     CLASSPATH environment variable if it is  set.
                     Directories are separated by colons. Thus the
                     general format for path is:
 
                          .:<your_path>
 
                     For example:
 
                          .:/home/avh/classes:/usr/local/java/classes
 
 
      -h             Generates code that can  be  placed  to  a  C
                     header file.
 
      -J flag        Passes flag directly to runtime system.
 
      -l             Displays line and local variable tables.
 
      -package       Default; shows only package,  protected,  and
                     public classes and members.
 
      -private       Shows all classes and members.
 
      -protected     Shows only protected and public  classes  and
                     members.
 
      -public        Shows only public classes and members.
 
      -s             Displays internal type signatures.
 
      -verbose       Prints stack size, number of locals, and args
                     for methods.
 
      -verify        Runs the verifier.
 
      -version       Prints out the javap version string.
 
 ENVIRONMENT VARIABLES
      CLASSPATH      Used to provide the system  with  a  path  to
                     user-defined    classes.    Directories   are
                     separated by colons.  For example:
 
                          .:/home/avh/classes:/usr/local/java/classes


ATTRIBUTES
      See attributes(5) for a description of the following  attri-
      butes:
 
      __________________________________
     | ATTRIBUTE TYPE|  ATTRIBUTE VALUE|
     |_______________|_________________|
     | Availability  |  SUNWjvdev      |
     |_______________|_________________|
 


SEE ALSO
      java(1),  javac(1),  javadoc(1),  javah(1),  jdb(1),  attri-
      butes(5)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SunOS 5.8           Last change: 6 June 1997                    3
 
 
 

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