File Extension Library

.CLASS File Extension

  • Developer by: Oracle
  • Category: Developer Files
  • Format: Binary

What are .CLASS files and how to open them?

Can't open .CLASS file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .CLASS file.

What is a .CLASS file extension?

.CLASS file extension is created by Oracle. .CLASS has been classified as Developer Files. The format of .CLASS file is Binary.

.CLASS is Java Class File

A CLASS file is a compiled .JAVA file created by the Java compiler. It contains bytecode, which is binary program code that is executable when run by a Java Virtual Machine (JVM). CLASS files are commonly bundled into .JAR files, which are included in the $CLASSPATH environment variable for execution.

CLASS files can be compiled from JAVA files using the javac command, which is included with a JVM installation. Many Java IDEs, such as Eclipse, can compile CLASS files on the fly as developers write program code.

Since there are multiple versions of the JVM (e.g., 1.4, 1.5, and 1.6), some CLASS files may not be compatible with certain JVM versions. The Java Runtime Environment (JRE) can execute CLASS files, but it cannot compile them since it does not include the javac binary.

NOTE: Oracle acquired Sun Microsystems, the original developers of Java. The JRE and JVM are often used synonymously to refer to the platform that runs Java applications.

List of all softwares that can open the Java Class File
Oracle Java Runtime Environment
Eclipse IDE for Java Developers
DJ Java Decompiler
Oracle Java Runtime Environment
Eclipse IDE for Java Developers
Oracle Java Runtime Environment
Eclipse IDE for Java Developers

How to fix problems with .CLASS files

  1. You need to update the application that you normally use to open .CLASS files. Only the latest version of the software supports the current .CLASS file format
  2. You need to check the .CLASS file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)