File Extension Database

Open CLASS File

CLASS file extension is used to denote a compiled Java source code file. Prior to compilation, Java files are stored in plaintext with the JAVA file extension. In order to run Java programs, the source code must be compiled to create a CLASS file, which can then be loaded into a Java Virtual Machine to execute the application. Many Java applications will make use of multiple classes, each of which is stored and loaded as an individual CLASS file.

Before executing an application written in Java, it must first be compiled. This process converts the plaintext source code of the application into bytecode, which is a set of instructions designed to be executed by a software interpreter, which in this case is the Java Virtual Machine (JVM). Unlike JAVA source files, CLASS files are not human-readable and you cannot open CLASS file using a text editor.

Java is a cross-platform compatible language, meaning that the bytecode produced by compiling a program on one platform will be able to run on the Java Virtual Machine of any other platform.

A CLASS file contains several separate sections including access flags, constants, classes, interfaces and methods. CLASS files are used by a Java program to create objects and define their behaviour. However, as CLASS files are run as part of an executable program, they should only be loaded into a JVM if they are from a known, trusted source as the program could potentially be malicious software.

You can open CLASS files, load and run on any platform which has a Java Virtual Machine. Alternatively, some CLASS files can be decompiled into their original, human-readable source code and opened with a standard text editor or development environment. However, in most cases the reverse engineering of compiled software is illegal, and whether or not decompiling the code for educational use is allowed will depend on the license and usage terms attached to the program.

Typical CLASS application file locations:

  • C:\Windows\system32\NOTEPAD.EXE %1

Frequently associated Windows objects:

  • class_auto_file

Open CLASS File on Windows

Open CLASS File on Mac OS

Open CLASS File on Android

If you downloaded a CLASS file on Android device you can open it by following steps below:

Open CLASS File on iPhone or iPad

To open CLASS File on iOS device follow steps below:

Populating this website with information and maintaining it is an ongoing process. We always welcome feedback and questions that can be submitted by visiting Contact Us page. However since there are many users visiting this website and because our team is quite small we may not be able to follow up personally on every request. Thank you for your understanding.

CLASS file article translations

open class fileopen class fileopen class fileopen class fileopen class fileopen class fileopen class fileopen class file