Web Reference: Jul 23, 2025 · Open Terminal (Mac) or Command Prompt (Windows). Navigate to the folder containing the java file and type the following command to compile. After hitting enter, the .class file will appear in the same folder for each .java file compiled. To run the .class file, it must have a main method in the .java file. First, have you compiled the class using the command line javac compiler? Second, it seems that your main method has an incorrect signature - it should be taking in an array of String objects, rather than just one: Mar 10, 2022 · To compile a Java code/program, we get the class file. Then we need to execute/run the class file. We need to use the command javac file_name_with_the_extension. For example, as I want to compile my Main.java, I will use the command javac Main.java. The c in javac indicates compile.
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