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javap(1)							      javap(1)

NAME
       javap - The Java Class File Disassembler

       Disassembles class files.

SYNOPSIS
       javap [ options ] class. . .

DESCRIPTION
       The  javap command disassembles a class file. Its output depends on the
       options used. If no options are used, javap  prints  out	 the  package,
       protected,  and	public fields and methods of the classes passed to it.
       javap prints 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 DocFooter();
	      public void init();
	      public void paint(java.awt.Graphics);
	  }

       The output from javap -c DocFooter yields:

	  Compiled from DocFooter.java
	  public class DocFooter extends java.applet.Applet {
	      java.lang.String date;
	      java.lang.String email;
	      public DocFooter();
	      public void init();
	      public void paint(java.awt.Graphics);
	  }

	  Method DocFooter()
	     0 aload_0
	     1 invokespecial #1 <Method java.applet.Applet()>
	     4 return

	  Method void init()
	     0 aload_0
	     1 sipush 500
	     4 bipush 100
	     6 invokevirtual #2 <Method void resize(int, int)>
	     9 aload_0
	    10 aload_0
	    11 ldc #3 <String "LAST_UPDATED">
	    13 invokevirtual #4 <Method java.lang.String getParameter(java.lang.String)>
	    16 putfield #5 <Field java.lang.String date>
	    19 aload_0
	    20 aload_0
	    21 ldc #6 <String "EMAIL">
	    23 invokevirtual #4 <Method java.lang.String getParameter(java.lang.String)>
	    26 putfield #7 <Field java.lang.String email>
	    29 return

	  Method void paint(java.awt.Graphics)
	     0 aload_1
	     1 new #8 <Class java.lang.StringBuffer>
	     4 dup
	     5 invokespecial #9 <Method java.lang.StringBuffer()>
	     8 aload_0
	     9 getfield #5 <Field java.lang.String date>
	    12 invokevirtual #10 <Method java.lang.StringBuffer append(java.lang.String)>
	    15 ldc #11 <String " by ">
	    17 invokevirtual #10 <Method java.lang.StringBuffer append(java.lang.String)>
	    20 invokevirtual #12 <Method java.lang.String toString()>
	    23 bipush 100
	    25 bipush 15
	    27 invokevirtual #13 <Method void drawString(java.lang.String, int, int)>
	    30 aload_1
	    31 aload_0
	    32 getfield #7 <Field java.lang.String email>
	    35 sipush 290
	    38 bipush 15
	    40 invokevirtual #13 <Method void drawString(java.lang.String, int, int)>
	    43 return

OPTIONS
       -help
	  Prints out help message for javap.

       -l Prints out line and local variable tables.

       -b Ensures backward compatibility with javap in JDK 1.1.

       -public
	  Shows only public classes and members.

       -protected
	  Shows only protected and public classes and members.

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

       -private
	  Shows all classes and members.

       -Jflag
	  Pass flag directly to the runtime system. Some examples:

	  javap -J-version
	  javap -J-Djava.security.manager -J-Djava.security.policy=MyPolicy MyClassName

       -s Prints internal type signatures.

       -c Prints out disassembled code, i.e., the instructions	that  comprise
	  the  Java bytecodes, for each of the methods in the class. These are
	  documented in the Java Virtual Machine Specification @
	  http://java.sun.com/docs/books/vmspec/.

       -verbose
	  Prints stack size, number of locals and args for methods.

       -classpath path
	  Specifies the path javap uses to look up classes. Overrides the
	  default or the CLASSPATH environment variable if it is set. Directo‐
	  ries are separated by colons. Thus the general format for path is:
	     .:<your_path>
	  For example:

       -bootclasspath path
	  Specifies path from which to load bootstrap classes. By default, the
	  bootstrap classes are the classes implementing the core Java plat‐
	  form located in jre/lib/rt.jar and several other jar files.

       -extdirs dirs
	  Overrides location at which installed extensions are searched for.
	  The default location for extensions is the value of java.ext.dirs.

ENVIRONMENT VARIABLES
       CLASSPATH
	  Used to provide the system a path to user-defined classes. Directo‐
	  ries are separated by colons, for example, For example:

SEE ALSO
       javac, java, jdb, javah, javadoc

				  05 Aug 2006			      javap(1)
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