finished

src/App.java

 public class App {
     public static void main(String[] args) throws Exception {
-        Shape shape1 = new Triangle(3);
+    	System.out.print("Triangle\n");
+        Shape shape1 = new Triangle(5);
         shape1.draw();
+        System.out.print("\n");
+        System.out.print("Rectangle\n");
+        Shape Shape2 = new Rectangle(4,4);
+        Shape2.draw();
+        System.out.print("\n");
+        System.out.print("Square\n");
+        Shape Shape3 = new Square(5);
+        Shape3.draw();
     }
 }

src/Rectangle.java

+public class Rectangle extends Shape{
+	Rectangle()
+	{
+		super();
+	}
+	Rectangle(int i)
+	{
+		super(i);
+	}
+	Rectangle(int width,int height)
+	{
+		super(width,height);
+	}
+	 @Override
+	  public float area() {
+	    return width*height;
+	  }
+	 @Override
+	  public float circumference()
+	 {
+		    float fSize = 2*(width+height);
+		    return fSize;
+	}
+	@Override
+	public void draw() {
+		int i,j;
+		for (i = 1; i <= height; i++) {
+	        for (j = 1; j <= width; j++) {
+	           System.out.print("*");
+	        }
+	        System.out.print("\n");
+	    }
+		
+	}
+
+}

src/Shape.java

 abstract public class Shape {
 
   protected int size;
-
+  protected int width;
+  protected int height;
   abstract public void draw();
   abstract public float area();
   abstract public float circumference();
@@ -11,10 +12,28 @@ abstract public class Shape {
 
   public Shape(){
     this.size = 3;
+    this.width = 3;
+    this.height=4;
   }
 
-  public Shape(int size){
+  public int getWidth() {
+	return width;
+}
+public void setWidth(int width) {
+	this.width = width;
+}
+public int getHeight() {
+	return height;
+}
+public void setHeight(int height) {
+	this.height = height;
+}
+public Shape(int size){
     this.size = size;
   }
+  public Shape(int width,int height){
+	    this.width = width;
+	    this.height = height;
+	  }
 
 }

src/Square.java

+public class Square extends Shape{
+	public Square()
+	{
+	    super();
+	}
+	
+	 public Square(int i)
+	  {
+	    super(i);
+	  }
+	@Override
+	public void draw()
+	{
+		for (int i = 0; i < size; i++) {
+			for (int j = 0; j < size; j++)
+			System.out.print("* ");
+			System.out.println();
+			}
+		
+	}
+	@Override
+	public float area() {
+		return size*size;
+	}
+	@Override
+	public float circumference() {
+		return 4*size;
+	}
+
+}