How do I get the command line arguments passed to the program?,

When creating a Java application we might want to pass a couple of parameters to our program. To get the parameters passed from the command line we can read it from the main(String[] args) method arguments.
As you know to make a class executable you need to create a method as follow:
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public static void main(String[] args) {}

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This method take an array of String as the parameter. You can guess that this array is the parameters that we pass to the program in the command line.

package org.kodejava.example.fundametal;

public class ArgumentParsingExample {
    public static void main(String[] args) {
        for (int i = 0; i < args.length; i++) {
            System.out.println("Argument " + (i + 1) + " = " +
                    args[i]);
        }

        // 
        // If you want to check if the number of supplied parameters
        // meet the program requirement you can check the size of 
        // the arguments array.
        //
        if (args.length < 3) {
            System.out.println(
                    "You must call the program as follow:");
            System.out.println(
                    "java ArgumentParsingExample arg1 arg2 arg3");

            //
            // Exit from the program with an error status, for 
            // instance we return -1 to indicate that this program 
            // exit abnormally
            //
            System.exit(-1);
        }

        System.out.println("Hello, Welcome!");
    }
}