What is a .CLASS File And How To Open It – Oracle (Visual Guide)

Table of Contents

Introduction

Have you downloaded a file with .class extension, but you have never seen this extension before? You most likely know what the file is, but you might be unsure on how to open it. Thanks to this easy guide you will be able to find out what .class file extension is, how to open it and how to work with it.

What is a .CLASS file?

The file extension .CLASS stands for Java Class File. This file extension was developed by Oracle. The file has the binary format, and it is a development related file.

What to know

There are currently 5 software that can open the .class file on 3 platforms.

How to open a .CLASS file?

In this part of the article we will show you how to open the .CLASS file on various operating systems.

How to open a .CLASS file on Windows (7, 8, 10)

To open the .class file on Windows, please follow these 4 easy steps.

1. The first step is to download the DJ Java Decompiler software. You will be using this software in order to open the file. You can also use Oracle Java Runtime Environment, dirtyJOE, JD-GUI, Jetbrains IntelliJ IDEA and DJ Java Decompiler software.

Step 2

Step 2: Locating your .CLASS file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choose the software and click ok

4. In the fourth step, after clicking “Open with”, you should see the DJ Java Decompiler software that you have downloaded. Click on the software and click “OK”. That’s all, now you have opened your file on Windows.

How to open a .CLASS file on Mac

To open the .class file on Mac, please follow these 4 easy steps.

1. In the first step you need to download the Jetbrains IntelliJ IDEA software. This software will be used for opening the file. Other software that can be used in opening this file is: Oracle Java Runtime Environment, JD-GUI and Jetbrains IntelliJ IDEA.

Step 2

Step 2: Finding your .CLASS file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Clicking “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choosing the software to open your file

4. After choosing the “Open with” option, you will have an option to choose the Jetbrains IntelliJ IDEA software you have downloaded. Click on the software and click “OK”. That’s all, now you have opened your file on Mac.

How to open a .CLASS file on Linux

Below you can see a visual guide on how to open the .class file on Linux in 4 easy steps.

1. The first step is to download the Jetbrains IntelliJ IDEA software. You will be using this software in order to open the file. You can also use Oracle Java Runtime Environment, JD-GUI and Jetbrains IntelliJ IDEA software.

Step 2

Step 2: Locate the .CLASS file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Hover over the “Open with” button

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Open the file choosing the software

4. In the fourth step, after clicking “Open with”, you should see the Jetbrains IntelliJ IDEA software that you have downloaded. Choose your software and click on “OK”. That’s all, now you have opened your file on Linux.

Still cannot open the .CLASS file?

If you cannot open the .CLASS file, it is entirely possible that you are trying to open the wrong file. The .CLASS file extension is similar to other file extensions such as: .classlist – SMART Technologies, .clb – Microsoft, .clb – ICQ, .cld – Canon, .cld – Sourcefire. You might be trying to open one of them. Please recheck the file extension again.

Conclusion

In this article you have learned how to open the .CLASS file with the DJ Java Decompiler, Oracle Java Runtime Environment, dirtyJOE, JD-GUI, Jetbrains IntelliJ IDEA programs on Windows, Jetbrains IntelliJ IDEA, Oracle Java Runtime Environment, JD-GUI programs on Mac and Jetbrains IntelliJ IDEA, Oracle Java Runtime Environment, JD-GUI software on Linux.