Q. Predict the output of following Java program

final class Complex {

private final double re;
private final double im;

public Complex(double re, double im) {
this.re = re;
this.im = im;
}

public String toString() {
return "(" + re + " + " + im + "i)";
}
}

class Main {
public static void main(String args[])
{
Complex c = new Complex(10, 15);
System.out.println("Complex number is " + c);
}
}