javap(1) javap(1)

NAME
       javap - Java class file disassembler

SYNOPSIS
       jjaavvaapp [ options ] class ...

DESCRIPTION
       The  jjaavvaapp  command disassembles a Java class file.  The options deter-
       mine the output.  If no options are used, jjaavvaapp prints out the ppaacckkaaggee,
       pprrootteecctteedd,  and  ppuubblliicc fields and methods of the classes passed to it.
       The jjaavvaapp command displays its output to ssttddoouutt.  For example,  compile
       the following class declaration:
              iimmppoorrtt jjaavvaa..aawwtt..**;;
              iimmppoorrtt jjaavvaa..aapppplleett..**;;

              ppuubblliicc ccllaassss DDooccFFooootteerr eexxtteennddss AApppplleett {{
                        SSttrriinngg ddaattee;;
                        SSttrriinngg eemmaaiill;;

                        ppuubblliicc vvooiidd iinniitt(()) {{
                             rreessiizzee((550000,,110000));;

                             ddaattee == ggeettPPaarraammeetteerr((""LLAASSTTUUPPDDAATTEEDD""));;
                             eemmaaiill == ggeettPPaarraammeetteerr((""EEMMAAIILL""));;
                        }}

                        ppuubblliicc vvooiidd ppaaiinntt((GGrraapphhiiccss gg)) {{
                             gg..ddrraawwSSttrriinngg((ddaattee ++ "" bbyy "",,110000,, 1155));;
                             gg..ddrraawwSSttrriinngg((eemmaaiill,,229900,,1155));;
                        }}
              }}

       The output from jjaavvaapp DDooccFFooootteerr yields:

              CCoommppiilleedd ffrroomm DDooccFFooootteerr..jjaavvaa
              ppuubblliicc ccllaassss DDooccFFooootteerr eexxtteennddss jjaavvaa..aapppplleett..AApppplleett {{
                   jjaavvaa..llaanngg..SSttrriinngg ddaattee;;
                   jjaavvaa..llaanngg..SSttrriinngg eemmaaiill;;
                   ppuubblliicc vvooiidd iinniitt(());;
                   ppuubblliicc vvooiidd ppaaiinntt((jjaavvaa..aawwtt..GGrraapphhiiccss));;
                   ppuubblliicc DDooccFFooootteerr(());;
              }}

OOPPTTIIOONNSS
       The following options are supported:

       -bb             Ensures backward compatibility with jjaavvaapp in JDK 1.1.

       -bboooottccllaassssppaatthh path
                      Specifies path from which to load bootstrap classes.  By
                      default, the bootstrap classes are  the  classes  imple-
                      menting the core Java platform located in jjrree//lliibb//rrtt..jjaarr
                      and jjrree//lliibb//cchhaarrsseettss..jjaarr.

       -cc             Prints out disassembled code, that is, the  instructions
                      that  comprise the Java bytecodes, for each of the meth-
                      ods in the class.  These are documented in the Java Vir-
                      tual Machine Specification.

       -ccllaassssppaatthh path
                      Specifies the path jjaavvaapp uses to look up classes.  Over-
                      rides the default or the CCLLAASSSSPPAATTHH environment  variable
                      if  it is set.  Directories are separated by colons (::).
                      Thus the general format for path is:

                           ..::<>

                      For example:

                           ..:://hhoommee//aavvhh//ccllaasssseess:://uussrr//llooccaall//jjaavvaa//ccllaasssseess


       -eexxttddiirrss dirs  Overrides location at  which  installed  extensions  are
                      searched.    The  default  location  for  extensions  is
                      jjrree//lliibb//eexxtt.

       -hheellpp          Prints out help message for jjaavvaapp.

       -JJflag         Passes flag directly to runtime system.

                      jjaavvaapp -JJ-vveerrssiioonn

                      jjaavvaapp -JJJJ-DDjjaavvaa..sseeccuurriittyy..mmaannaaggeerr
                      -DDjjaavvaa..sseeccuurriittyy..ppoolliiccyy==MMyyPPoolliiccyy MMyyCCllaassssNNaammee

       -ll             Displays line and local variable tables.

       -ppaacckkaaggee       Shows only package, protected, and  public  classes  and
                      members. This is the default.

       -pprriivvaattee       Shows all classes and members.

       -pprrootteecctteedd     Shows only protected and public classes and members.

       -ppuubblliicc        Shows only public classes and members.

       -ss             Displays internal type signatures.

       -vveerrbboossee       Prints  stack size, number of locals, and args for meth-
                      ods.

ENVIRONMENT VARIABLES
       CCLLAASSSSPPAATTHH      Used to provide the system with a path  to  user-defined
                      classes. Directories are separated by colons.  For exam-
                      ple:

                 ..:://hhoommee//aavvhh//ccllaasssseess:://uussrr//llooccaall//jjaavvaa//ccllaasssseess

SEE ALSO
       jjaavvaa(1), jjaavvaacc(1), jjaavvaaddoocc(1), jjaavvaahh(1), jjddbb(1)



                                 13 June 2000                         javap(1)