trouble writing a static version of the add and subtract methods (this is in java)

Question

I need help writing a static version of the add and subtract methods. i have tried to do so but im not really sure if this is the right way and also my equals method is not working . When i compile my equals method it always prints false.

public static void main(String[] args) {
    Complex c1 = new Complex(7, 7);
    Complex c2 = new Complex(7, 7);

    System.out.println(Complex.add(c1, c2));
    System.out.println(c1.equals(c2));

}

}

class Complex {

private static double realPart;
private static double imaginaryPart;

public Complex() {
    realPart = 0;
    imaginaryPart = 0;

}

public Complex(double c1, double c2) {
    realPart = c1;
    imaginaryPart = c2;

}

public static Complex add(Complex firstNumber, Complex secondNumber) {

    Complex result = new Complex();
    firstNumber.realPart = 7;
    secondNumber.imaginaryPart = 7;
    result.realPart = firstNumber.realPart + secondNumber.imaginaryPart;

    return result;

}

public static Complex subtract(Complex firstNumber, Complex secondNumber) {
    Complex result = new Complex();
    firstNumber.realPart = 7;
    secondNumber.imaginaryPart = 7;
    result.realPart = firstNumber.realPart + secondNumber.imaginaryPart;
    return result;
}

public boolean equals(Complex firstNumber, Complex secondNumber) {

    if (firstNumber == secondNumber) {
        return true;
    } else {
        return false;
    }

}

public String toString() {

    return "result= " + realPart;
}
}

Answer 1

Objects are always compared using equals() method.

== isn't the way to compare Objects!!!

(THIS HAS BEEN POSTED ABOUT HUNDREDS OF TIMES OR MORE ON STACK OVERFLOW FORUM)

Also,add an @Override annotation to be more clear so that you're overriding the equals method...

Improve your code as :-

@Override
public boolean equals(Complex firstNumber, Complex secondNumber) {
if (firstNumber.equals(secondNumber)) {
    return true;
} else {
    return false;
}

}