What I do wrong?

package pl.codegym.task.task05.task0502; /* Zaimplementuj metodę walka */ public class Kot { public int wiek; public int waga; public int sila; public int moc; public Kot(int wiek, int waga, int sila) { this.wiek = wiek; this.waga = waga; this.sila = sila; this.moc = this.wiek + this.waga + this.sila; } public int getWiek() { return wiek; } public int getWaga() { return waga; } public int getSila() { return sila; } public int getMoc() { return moc; } public boolean walka(Kot innyKot) { if (this.moc > innyKot.moc) return true; else return false; } public static void main(String[] args) { Kot kot1 = new Kot(10,10,3); Kot kot2 = new Kot(5,5,5); int kot1wiek = kot1.getWiek(); int kot1waga = kot1.getWaga(); int kot1sila = kot1.getSila(); int kot2wiek = kot2.getWiek(); int kot2waga = kot2.getWaga(); int kot2sila = kot2.getSila(); System.out.println(kot1.walka(kot2)); System.out.println(kot2.walka(kot1)); } }