OpenClosedPrincipleproblem/Square.java

public class Square implements Shape, Resizable {
    private double side;
    private String color;
    
    public Square(double side, String color) {
        this.side = side;
        this.color = color;
    }
    
    @Override
    public double calculateArea() {
        return side * side;
    }
    
    @Override
    public double calculatePerimeter() {
        return 4 * side;
    }
    
    @Override
    public String getColor() {
        return color;
    }
    
    @Override
    public void setColor(String color) {
        this.color = color;
    }
    
    public double getSide() {
        return side;
    }
    
    public void setSide(double side) {
        this.side = side;
    }
    
    @Override
    public void resize(double factor) {
        if (factor <= 0) {
            throw new IllegalArgumentException("Resize factor must be positive");
        }
        this.side *= factor;
    }
    
    @Override
    public void resizeWidth(double factor) {
        // For square, resizing width also resizes height to maintain square property
        resize(factor);
    }
    
    @Override
    public void resizeHeight(double factor) {
        // For square, resizing height also resizes width to maintain square property
        resize(factor);
    }
}