Java toString() method override - oop

Question

With the two classes I am making square objects in preparation for my exam tomorrow. S1 is created using default and S2 via non-default. For some reason the it will print out all values excluding the Side as 0. Please help.
public class SquareRunner{
public static void main(String[] args)
{
Square S1 = new Square();
Square S2 = new Square(4);
System.out.println(S1.toString());
System.out.println(S2.toString());
}
}
import java.lang.Math;
public class Square
{
private int s, a, p;
private double d;
public Square()
{
s = 1;
}
public Square(int side)
{
s = side;
}
public int getSide()
{
return s;
}
public int getArea()
{
a = s * s;
return a;
}
public double getDiagonal()
{
double d;
d = Math.sqrt(Math.pow(s,2) + Math.pow(s,2));
return d;
}
public int getPerimeter()
{
p = 4 * s;
return p;
}
public String toString()
{
return "Side: " + s + " Perimeter: " + p + " Area: " + a + " Diagonal: "
+ d;
}
}

Answer 1

Try this out
public String toString()
{
return "Side: " + s + " Perimeter: " + this.getPerimeter() + " Area: " + this.getArea() + " Diagonal: "
+ this.getDiagonal();
}
If you want to print out the perimeter, area, and diagonal then you have to calculate those values to be printed.
If you want to print these out in your SquareRunner class then you can do this
public class SquareRunner{
public static void main(String[] args)
{
Square S1 = new Square();
Square S2 = new Square(4);
System.out.println(S1.getArea());
...
...
}
}