How to set JVM arguments in IntelliJ IDEA?

Intellij allows you to specify two types of arguments when running a Java program:

• VM Options
  • Enables you to modify attributes of the JVM, including stack/heap memory allocation, system properties, GC flags, etc.
• Program Arguments
  • Values entered here are passed into the String[] parameter of your main method when the program begins.

In the above image, we specify a single system property (under VM Options) named example that has a value of Hello World!.

We also specify two program arguments (under Program Arguments): Hello and World!.

After clicking either the Apply button or the OK button, we can run the following program:

public static void main(String[] args) {
    System.out.println(System.getProperty("example"));
    System.out.println(args[0] + " " + args[1]);
}

The output of this program is as follows:

Hello World!
Hello World!

To create a Run/Debug Configuration, see: Create and Edit Run/Debug Configurations