Web Reference: Mar 24, 2026 · Command-line arguments in Java are space-separated values passed to the main (String [] args) method. JVM wraps them into the args [] array, where each value is stored as a string (e.g., args [0], args [1], etc.). The number of arguments can be checked using args.length. Command-line entries following classname are the arguments for the main method. Executes a program encapsulated in a JAR file. It’s quite common to run applications from the command-line using arguments. Especially on the server-side. Usually, we don’t want the application to do the same thing on every run: we want to configure its behavior some way. In this short tutorial, we’ll explore how can we handle command-line arguments in Java.
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