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3 steps to open file with CLASS extension

Usually solving problems with CLASS file is simple – just install proper software and open the file. Read the guide and open CLASS file now!

  1. 1. CLASS File Extension
  2. 2. What is a(n) CLASS file?
  3. 3. How to open CLASS file?
    1. 3.1 Install a program that supports CLASS files
    2. 3.2 Find and download proper software
      1. 3.2.1 Programs that support files with CLASS extension
    3. 3.3 Check the CLASS file for errors
  4. 4. Similar file extensions

CLASS File Extension

File
  • File type Java Class Format
  • File developer Oracle
  • File category Developer Files
  • File popularity rating
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What is a(n) CLASS file?

The Java CLASS file format is a platform-independent binary file used to store compiled Java code. CLASS files contain bytes that can represent Java byte code, referenced classes and other data that pertain to the structure of the compiled program.

CLASS files may be compiled using the javac command from the command line. When executed, the Java Virtual Machine reads the CLASS file and translates it into a sequence of Bytecode instructions which are then used to generate output. CLASS files can be opened in any text-editor, although this will give little useful information due to them being binary files.

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How to open CLASS file?

There could be multiple reasons for which the system does not support given file. In the case of CLASS extension, it is probable that none of the installed programs support given file type. Therefore, user should undertake the following steps

Step 1: Install a program that supports CLASS files

If an application that supports CLASS files is installed on user’s system, but is not used to open such files by default, right-click on the file icon and choose "Open with" option from the menu. Next, select the proper application and check the "Always use the selected application to open this kind of files" box. The system will store this information in its registry and use the selected program to open files with CLASS extension by default.

Hint for Mac OS users

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For Mac OS users the procedure is analogous – open the file menu by right-clicking on the CLASS file and choose "Information" option and select "Open with program" option. From the submenu select an application and click on "Change all" button.

Step 2: Find and download proper software

Inability to open CLASS files may also be related to the lack of any application that supports given file being installed on the system. Should that be the case, user needs to download and install one of the following applications. Once installed, the system will automatically associate newly installed application with CLASS files. If this step fails, see step 1.

Programs that support files with CLASS extension

Windows programs
Windows
MAC OS programs
MAC OS
Linux programs
Linux

Step 3: Check the CLASS file for errors

Sometimes, although relatively rarely, steps 1 and 2 might not lead to expected results. There can be several reasons for such situation to occur:

  • CLASS file has been downloaded from the internet but for some reason it is incomplete. In such case the file should be re-downloaded and opened again.
  • Structure of given CLASS file could be corrupted and as such the program is not able to open the file
  • Storage medium on which the file was stored is damaged
  • It is important to ascertain that the icon representing given file is not a shortcut a related CLASS file no longer present in the location to which the shortcut points
  • If the user account has restricted access privileges it is advised to contact the system administrator or an IT expert

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