I can't get my premium account working

Question

It charged my credit card but i do not have premium

Answer 1

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No. Static has nothing to do wth "not being altered." Static means "pertains to the class, rather than to any instance of the class."
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I believe that jverd is exactly right.
Notice that in this example the findChar() method is not a static method and must be
called on an actual object (instance), in this case the "tester" object.
// Soundex.java
public class Soundex {
    private String possibleValues = "AEIOUY";
    public void findChar(char searchChar) {
        String searchString = String.valueOf(searchChar);
        if (possibleValues.indexOf(searchString) != -1) {
            System.out.println("found " + searchString);
        else {
            System.out.println("unable to find " + searchString);
    public static void main(String [] args) {
        Soundex tester = new Soundex();
        tester.findChar('A');
        tester.findChar('C');
}