Problems converting from char to string

Question

I tried creating a little programm, that randomly puts chars together (in this case 2 to keep it simple) until it gets the requested combination (here: "ab"). But unfortunately I seem to have trouble adding the char "rand" onto the string "string", because the comparison in the while-loop doesn't seem to work even though it has the right combination. Could it be, that Java adds invisible characters when you create a String? How can I add the char properly?

public static void main(String[] args) {
    // TODO Auto-generated method stub
    String string = "";
    String comp = "ab";
    int counter = 0;
    char rand;

    while (string != comp) {
        string = "";
        for (int i = 1; i <= comp.length(); i++) {
            rand = (char) Math.floor(Math.random() *26 + 97);
            //JOptionPane.showMessageDialog(null, rand);
            string += rand;
            //JOptionPane.showMessageDialog(null, string);
        }
        //JOptionPane.showMessageDialog(null, string + ", " + counter);
        counter++;
        System.out.println(string + ", " + counter);
    }

    JOptionPane.showMessageDialog(null, string);
    JOptionPane.showMessageDialog(null, "Achieved after " + counter + " tries");
}

while(!string.equals(comp)) – RAZ_Muh_Taz May 09 '18 at 16:54 — RAZ_Muh_Taz, May 09 '18 at 16:54

score 1 · Answer 1 · answered May 09 '18 at 16:56

1

use the String equals method to compare Strings in Java

while (!string.equals(comp)) {
    ...
}

answered May 09 '18 at 16:56

RAZ_Muh_Taz

4,059
1
13
26

Thanks! I knew it had to be some stupid, simple mistake on my side. – Moosi312 May 09 '18 at 17:05

Problems converting from char to string

1 Answers1