ArrayIndexOutOfBoundsException when launching a java program

Question

I am currently working on an assignment but there seems to be a problem when running my code.

public class caesar {
    public static void main(String args[         


        

Answer 1

You are not passing command line arguments to your program and don't check whether they are passed. To pass arguments launch your program like

java caesar arg0 arg1

For example:

java caesar somestring 10

To do this in NetBeans 8.0.2 IDE, open Project Properties, select the Run item, then specify the arguments there:

You may probably also want to check the number of passed arguments in advance to output the friendly error message. For example:

public static void main(String args[]) {
    if(args.length != 2) {
        System.err.println("Usage: java caesar  ");
        return;
    }
    ... // the rest of your code
}