How to use API doc(demo) to create s square rectangle?

// Rectangle(Dimension d) // Constructs a new Rectangle whose top left corner is (0, 0) // and whose width and height are specified by the Dimension argument.// Dimension(Dimension d) // Creates an instance of Dimension whose width and height // are the same as for the specified dimensionimport java.awt.Dimension;import java.awt.Rectangle;public class TestJava {    public static void main(String[] args) {        Dimension d = new Dimension(100, 100);        Rectangle square = new Rectangle(d);        System.out.println(square);    }}