Java: Method Exercises 4

import javax.swing.*;

class MethodExercises4 {
    //======================================================= main
    public static void main(String[] args) {

        output("I chose ", choose(false, 33, 99));
        output("You chose ", choose(true, choose(false, 1, 2)
                           , choose(true, 3, 4)));
        output( 10 % 6 );
        output(doubleLetter("Never seen"));
        output(doubleLetter("Always invisible"));
    }

    //===================================================== choose
    static int choose(boolean condition, int a, int b) {
        if (condition) {
            return a;
        }
        return b;
    }

    //====================================================== output
    static void output(int i) {
        output("Result = ", i);
    }

    //====================================================== output
    static void output(String message, int i) {
        JOptionPane.showMessageDialog(null, message + i);
    }

    //================================================ doubleLetter
    static int doubleLetter(String s) {
        int result = -1;
        for (int pos=0; pos < s.length()-1; pos++) {
            if (s.charAt(pos) == s.charAt(pos+1)) {
                return pos;
            }
        }
        return -1;
    }
}