الدوال (Methods)

public class Main {
    static double vat(double amount) {
        return amount * 0.15;
    }

    static String grade(int score) {
        if (score >= 90) return "A";
        if (score >= 80) return "B";
        return "C";
    }

    public static void main(String[] args) {
        System.out.println(vat(1000));
        System.out.println(grade(85));
    }
}

150.0
B

public class Main {
    static int add(int a, int b) {
        return a + b;
    }

    static double add(double a, double b) {
        return a + b;
    }

    public static void main(String[] args) {
        System.out.println(add(2, 3));
        System.out.println(add(2.5, 3.5));
    }
}

5
6.0