 | Chapter 2 |  |
Command-line arguments
Java's main(String[] args) method takes a String array named args as an argument. The elements of this array are known as command-line arguments, which correspond to the arguments provided by the user when the Java program is executed. For example, a Java program called HelloWorld can be invoked with additional command-line arguments as follows (in a "cmd" shell):
java HelloWorld Tartu Tallinn 180
Each element in the array args is a String (including, for example, "180"). If we need integers or doubles as an input, the conversion is needed:
int distance = Integer.parseInt(args[2]); double distance = Double.parseDouble(args[2]);
In the example, the first line converts the third element of the array args (string "180") into an integer and the second line converts the value into a double.
In IntelliJ, the command-line arguments can be input into the Program arguments (Run-menu - > Edit Configuration) like this:
| Chapter 2 | |