diff --git a/Square.java b/Square.java
new file mode 100644
index 0000000..68f1f42
--- /dev/null
+++ b/Square.java
@@ -0,0 +1,41 @@
+package 矩形与正方形（LSP）;
+
+
+/**
+ * 姝ｆ柟褰㈢被锛堥潪 public锛?
+ * @author 方初阳
+ * @version 1.0
+ * @created 23-10月-2025 20:05:33
+ */
+class Square implements Shape {
+
+	private double side;
+
+	public Square(){
+
+	}
+
+	public void finalize() throws Throwable {
+
+	}
+	/**
+	 * 
+	 * @param side
+	 */
+	public Square(double side){
+
+	}
+
+	@Override
+	public double getArea(){
+		return 0;
+	}
+
+	/**
+	 * 
+	 * @param side
+	 */
+	public void setSide(double side){
+
+	}
+}//end Square
\ No newline at end of file