How to create a Java program in idea?

To create a Java program, you can follow the steps below:

1. To install a Java development environment: First, you need to install the Java Development Kit (JDK) on your computer. You can download the version of JDK suitable for your operating system from the Oracle official website and follow the installation guide.
2. Setting environment variables: After installing JDK, you need to configure the system’s environment variables so that the computer can locate the Java installation path. The specific method of operation varies depending on the operating system, and you can search for relevant tutorials on the internet for guidance.
3. Write Java code: Use any text editor, such as Notepad, or dedicated integrated development environments (IDE) like Eclipse, IntelliJ IDEA, etc., to write Java code. Java code is stored in the form of files, with a .java file extension.
4. Compile Java code by using either command-line tools or an IDE to convert the code into bytecode files. When using the command-line, you can execute the compilation process with the javac command. For example, running javac HelloWorld.java will compile the source file named HelloWorld.java into a bytecode file named HelloWorld.class.
5. To run a Java program: After successful compilation, you can use the java command to run the Java program. For example, typing java HelloWorld will execute the Java program named HelloWorld.

The above is a simple process of creating a Java program. With a deeper understanding and learning of Java, you will be able to build more complex and powerful Java applications.