ADD file via upload

Square.java

@@ -0,0 +1,57 @@
+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);
+    }
+}