Question

As you can probably understand from the question itself, I’m new to Java.
I was given an exercise to write a Java program which receives a character, prints it and the next character in the Unicode table.

Now, I have the solution to this exercise:

public static void main(String[] args){
    char c = args[0].charAt(0);
    char c1 = (char)(c + 1);
    System.out.println(c + "\t" + c1);
}

I understand basic idea of this code, but I’m trying to run this code in Eclipse I get an annoying error:

Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 0
at MainClass.main(MainClass.java:9)

Note: I have yet to run a Java program that actually receives something as a parameter so I guess it’s a stupid beginners’ mistake… Here is the full code that I tried to compile in Eclipse:

public class MainClass {

    /**
     * @param args
     */

    public static void main(String[] args){
        char c = args[0].charAt(0);
        char c1 = (char)(c + 1);
        System.out.println(c + "\t" + c1);
    }
}

Thanks in advance

Answer 1

• Select “Run -> Run Configurations” from the menu.
• Search for you project in the list on the left and select it.
• Select the “Arguments” tab on the right.
• Write the argument you want to pass to the programm in “Programm arguments”.
• Click “Run”