Downloaded a java file but cant run

This is a "picture" of the problem. The file extension should be class , not java. And the play button on the right should be green. No IDE in the world can compensate non-understanding.

Why do you think the extension should be class? A class file is not Java sources, but compiled Java file. IntelliJ can automatically decompile a class file to some extent to show you something that is similar to the original java file, but the source file always is a java file.

If you compile a java file, you get a class file out of it. Regarding the greyed out "Play" button. Left of it you see a dropdown that has nothing selected. If no run configuration is selected, those buttons of course are grayed out. Open the dropdown, create or select a run configuration and the buttons become active. Hi again, I have downloaded jdk and have updated the Path environment variable but still I am getting the same message. So what is your PATH set to? In other words I would say find your javac.

Yes "javac. No I didn't close any open cmd window. Abhishk Singh. The semicolon separates different directories. Try appending the jdk path to PATH variable under environment variables. Simply download and install this tool and drag and drop the jar file to JAR Runner. In addition, you can also choose to open jar files with JAR Runner. This is a simple and free application, so be sure to download JAR Runner.

Note : If this problem persists, you might want to check your browser. Sometimes, it can download jar files incorrectly and can cause this problem to appear. To fix it, be sure to use a different browser to download the file and check if that solves the problem.

Jar files not opening on Windows 10 can be a big problem, especially if you use Java applications frequently. However, you should be able to fix the problem simply by using one of our solutions! Commenting as. Not you? Save information for future comments. JAR files are used as program libraries or as standalone programs, like games or add-ons, for PC and phones.

When JAR files are not opening, another great method is to simply use a universal file opener. One tool to open them all! If the file doesn't have any public class, we can save it with any name, but after compilation, a bytecode file will be generated with the name of the class containing the main method. Step 3 Now, open the command prompt and open the directory in which we have saved our program by using the following command.

Step 5 After the code is compiled, it generates a bytecode file in the same folder having the. This is the file which is executed by the JRE. To run this file, use the following command. JavaTpoint offers too many high quality services.

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