Having problems opening a class file?

Find out what programs can help open, view, play or convert your class files.

Opening class files
Java Class File

Did your computer fail to open a class file? We explain what class files are and recommend software that we know can open or convert your class files.

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What is class file?

Compiled .JAVA file created by the Java compiler; contains bytecode, which is program code that is machine-readable and executable when run on a Java Virtual Machine (JVM); commonly bundled in to .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 on certain JVMs. 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.

Software that will open, convert or fix class files

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