Managing Source and Class Files
Many implementations of the Java platform rely on hierarchical file systems to manage source and class files, although The Java Language Specification does not require this. The strategy is as follows.
Put the source code for a class, interface, enumeration, or annotation type in a text file whose name is the simple name of the type and whose extension is .java . For example:
//in the Rectangle.java file package graphics; public class Rectangle
Then, put the source file in a directory whose name reflects the name of the package to which the type belongs:
The qualified name of the package member and the path name to the file are parallel, assuming the Microsoft Windows file name separator backslash (for UNIX, use the forward slash).
- class name – graphics.Rectangle
- pathname to file – graphics\Rectangle.java
As you should recall, by convention a company uses its reversed Internet domain name for its package names. The Example company, whose Internet domain name is example.com , would precede all its package names with com.example . Each component of the package name corresponds to a subdirectory. So, if the Example company had a com.example.graphics package that contained a Rectangle.java source file, it would be contained in a series of subdirectories like this:
. \com\example\graphics\Rectangle.java
When you compile a source file, the compiler creates a different output file for each type defined in it. The base name of the output file is the name of the type, and its extension is .class . For example, if the source file is like this
//in the Rectangle.java file package com.example.graphics; public class Rectangle < . . . >class Helper
then the compiled files will be located at:
\com\example\graphics\Rectangle.class \com\example\graphics\Helper.class
Like the .java source files, the compiled .class files should be in a series of directories that reflect the package name. However, the path to the .class files does not have to be the same as the path to the .java source files. You can arrange your source and class directories separately, as:
\sources\com\example\graphics\Rectangle.java \classes\com\example\graphics\Rectangle.class
By doing this, you can give the classes directory to other programmers without revealing your sources. You also need to manage source and class files in this manner so that the compiler and the Java Virtual Machine (JVM) can find all the types your program uses.
The full path to the classes directory, \classes , is called the class path, and is set with the CLASSPATH system variable. Both the compiler and the JVM construct the path to your .class files by adding the package name to the class path. For example, if
is your class path, and the package name is
then the compiler and JVM look for .class files in
\classes\com\example\graphics.
A class path may include several paths, separated by a semicolon (Windows) or colon (UNIX). By default, the compiler and the JVM search the current directory and the JAR file containing the Java platform classes so that these directories are automatically in your class path.
Setting the CLASSPATH System Variable
To display the current CLASSPATH variable, use these commands in Windows and UNIX (Bourne shell):
In Windows: C:\> set CLASSPATH In UNIX: % echo $CLASSPATH
To delete the current contents of the CLASSPATH variable, use these commands:
In Windows: C:\> set CLASSPATH= In UNIX: % unset CLASSPATH; export CLASSPATH
To set the CLASSPATH variable, use these commands (for example):
In Windows: C:\> set CLASSPATH=C:\users\george\java\classes In UNIX: % CLASSPATH=/home/george/java/classes; export CLASSPATH
Advance Programs and Tricks in Java
Modify your Java class files easy with an interactive GUI.
Since it is not possible to edit a class file directly, this tool changes the class file to Smali version which is editable. After making the required changes, this tool converts the modified Smali to the modified Class file.
- Modify a given Java class file
- Allows Pen-tester to verify if their java desktop application is safe from Auth bypass
- Can help you change the logical behavior of a Jar file by modifying a class
- You can override private methods, change access modifier for variables of a class using ClassModifier.
- Many other possibilities.
- Open class (CTRL+O)- Takes the input class which need to be modified
- Open Project (CTRL+P)– You can reopen the project created using this feature.
- Save & Convert (CTRL+S) – Saves & Convert the code to modified Class and Smali file
- Export Class (CTRL+E) – Export modified class
- Java 2 Smali Helper — Opens a tab where you can write any Java code which on saving will show its equivalent Smali code
- Smali 2 Java code — Opens a tab where you can write any Smali code which on saving will show its equivalent Java code
- Increase Code FontSize (CTRL+I) – Allows you to increase font size of shown code.
- Decrease Code FontSize (CTRL+D) – Allows you to decrease the font size of shown code.
- Remove all tabs – Removes all currently shown tabs.
- Update Software – Helps you to update the current software if any update is available
- How to use Class Modifier– Contains the documentation of this tool
- It comes along with the software
- Contains the helper jars used by program
- ClassModifier_lib\userLibrary is automatically added in classpath while compiling code. If you wish to compile your code using external jars then place those external jars inside ClassModifier_lib\userLibrary
- Open the Java class to be Modified
- On opening, ClassModifier will open the Smali version of the class file
- Edit the smali file and make the required changes
- Save the smali file
- Modified java class file will be created which can be anytime exported using the File -> Export Class button.
- Since Smali editing can be difficult, 2 options are provided — Java 2 Smali Helper and vice-versa.
- As name suggests, Java 2 Smali Helper lets you see the Smali equivalent code for the input Java code.
- Similarly, Smali 2 Java Helper lets you see the Java equivalent code for the input Smali code.
Note: This software is meant for educational purpose only. Don’t use it for any illegal activity.
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Digitürk başvuru güncel adresine hoşgeldiniz. Hemen başvuru yaparsanız anında kurulum yapmaktayız.
tutku iç giyim Türkiye’nin önde gelen iç giyim markalarından birisi olmasının yanı sıra en çok satan markalardan birisidir. Ürünleri hem çok kalitelidir hem de pamuk kullanımı daha fazladır.
nbb sütyen hem kaliteli hem de uygun fiyatlı sütyenler üretmektedir. Sütyene ek olarak sütyen takımı ve jartiyer gibi ürünleri de mevcuttur. Özellikle Avrupa ve Orta Doğu’da çokça tercih edilmektedir.
yeni inci sütyen kaliteyi ucuz olarak sizlere ulaştırmaktadır. Çok çeşitli sütyen varyantları mevcuttur. iç giyime damga vuran markalardan biridir ve genellikle Avrupa’da ismi sıklıkla duyulur.
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Updating a JAR File
The Jar tool provides a u option which you can use to update the contents of an existing JAR file by modifying its manifest or by adding files.
The basic command for adding files has this format:
jar uf jar-file input-file(s)
- The u option indicates that you want to update an existing JAR file.
- The f option indicates that the JAR file to update is specified on the command line.
- jar-file is the existing JAR file that is to be updated.
- input-file(s) is a space-delimited list of one or more files that you want to add to the JAR file.
Any files already in the archive having the same pathname as a file being added will be overwritten.
When creating a new JAR file, you can optionally use the -C option to indicate a change of directory. For more information, see the Creating a JAR File section.
Examples
Recall that TicTacToe.jar has these contents:
META-INF/MANIFEST.MF TicTacToe.class TicTacToe.class TicTacToe.java audio/ audio/beep.au audio/ding.au audio/return.au audio/yahoo1.au audio/yahoo2.au example1.html images/ images/cross.gif images/not.gif
Suppose that you want to add the file images/new.gif to the JAR file. You could accomplish that by issuing this command from the parent directory of the images directory:
jar uf TicTacToe.jar images/new.gif
The revised JAR file would have this table of contents:
META-INF/MANIFEST.MF TicTacToe.class TicTacToe.class TicTacToe.java audio/ audio/beep.au audio/ding.au audio/return.au audio/yahoo1.au audio/yahoo2.au example1.html images/ images/cross.gif images/not.gif images/new.gif
You can use the -C option to «change directories» during execution of the command. For example:
jar uf TicTacToe.jar -C images new.gif
This command would change to the images directory before adding new.gif to the JAR file. The images directory would not be included in the pathname of new.gif when it’s added to the archive, resulting in a table of contents that looks like this:
META-INF/MANIFEST.MF META-INF/MANIFEST.MF TicTacToe.class TicTacToe.class TicTacToe.java audio/ audio/beep.au audio/ding.au audio/return.au audio/yahoo1.au audio/yahoo2.au example1.html images/ images/cross.gif images/not.gif new.gif