Command Line Arguments in Java | Java Programming | Runtime input in Java
The java command-line argument is an argument i.e. passed at the time of running the java program.
The arguments passed from the console can be received in the java program and it can be used as an input. The users can pass the arguments during the execution bypassing the command-line arguments inside the main() method.
We need to pass the arguments as space-separated values. We can pass both strings and primitive data types(int, double, float, char, etc) as command-line arguments. These arguments convert into a string array and are provided to the main() function as a string array argument.
When command-line arguments are supplied to JVM, JVM wraps these and supplies them to args[]. It can be confirmed that they are wrapped up in an args array by checking the length of args using args.length.
Internally, JVM wraps up these command-line arguments into the args[ ] array that we pass into the main() function. We can check these arguments using args.length method. JVM stores the first command-line argument at args[0], the second at args[1], the third at args[2], and so on.
Benefits of Command Line arguments
1. Command line arguments allows to configure the application behavior by passing the arguments before start of the application. Batch processes are one of the example where command line arguments are heavily used to execute java commands with configuration parameters. This mechanism enables dynamic parameterization of Java programs through console inputs, enhancing versatility and interactivity.
2. Command line arguments facilites user input retrieval and manipulation in case of console based applications
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