upload1

src/App.java

@@ -2,5 +2,8 @@ public class App {
     public static void main(String[] args) throws Exception {
         Shape shape1 = new Triangle(3);
         shape1.draw();
+        
+        Shape shape2 = new Square(3);
+        shape2.draw();
     }
 }

src/Square.java

+public class Square extends Shape{
+
+    public Square() {
+        super();
+    }
+    public Square(int i) {
+        super(i);
+    }
+    public void draw(){
+        for (int i = 0; i <= size+1; i++) {
+            if (i == 0 || i == size+1) {
+                for (int j = 0; j < size; j++) {
+                    System.out.print("--");
+                }
+                System.out.println(""); //enter a new line
+            } else {
+                //else
+                for (int j = 0; j <= size; j++) {
+                    if (j == 0 || j == size - 1) {
+                        System.out.print("|  ");
+                    } else {
+                        System.out.print(" "+" ");
+                    }
+                }
+                System.out.println(""); //enter a new line
+            }
+        }
+    }
+      //@Override
+      public float area() {
+        float fSize = size;
+        float area = fSize * fSize;
+        return area;
+      }
+    
+      //@Override
+      public float circumference() {
+        float fSize = size;
+        float circ = fSize + fSize +fSize +fSize;
+        return circ;
+      }
+}