How to Use Inheritence in the jsp

<%! javax.servlet.jsp.JspWriter pw; class Rectangle { int length =10; int breadth =20 ; public int areaOfRectangle() throws java.io.IOException { pw.println("Calculating the area of a rectangle...
"); return(length*breadth); } } class Square extends Rectangle { public int areaOfSquare() throws java.io.IOException { pw.println("Calculating the area of a square...
"); return(length*length); } } %> <% pw = out; Square sq = new Square(); int area1 = sq.areaOfRectangle(); out.println(area1); out.println("
"); int area2 = sq.areaOfSquare(); out.println(area2); %>