Inheritance example

[kris4u4ever]

import java.io.*;
class rectangle
{
int l,b;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
rectangle()
{
try
{
System.out.println("Enter l & b values");
l = Integer.parseInt(br.readLine());
b = Integer.parseInt(br.readLine());
}
catch(Exception e)
{}
}
void area()
{
System.out.println("area of rectangle = "+(l*b));
}
class cuboid extends rectangle
{
int h;
cuboid()
{
h=5;
System.out.println("Volume of cuboid = "+(l*b*h));
}
}
}
class single
{
public static void main(String args[])
{
System.out.println("In");
cuboid cb = new cuboid();
System.out.println("out");
}
}


Hello, can any one help me with this
when i compile the code i am getting this error


single.java:36: cannot find symbol
symbol:class cuboid
location:class single
cuboid cb = new cuboid();
single.java:36: cannot find symbol
symbol:class cuboid
location:class single
cuboid cb = new cuboid();

[Eranga]

cuboid is a method in the Rectangle class. You cannot initiate a method.

cuboid cb = new cuboid();

You never cannot do this. Do you want to call that method, is it? Since it's not a static member of the class, you have to call with the Rectangle class initialization.

[Fubarable]

cuboid is an inner class and such needs to be called on a rectangle instance. This will work:

class single
{
  public static void main(String args[])
  {
    System.out.println("In");
    rectangle.cuboid cb = new rectangle().new cuboid();
    //cuboid cb = new cuboid();
    System.out.println("out");
  }
}

but it's ugly and unwieldy. I recommend that you make it a stand-alone class, and pass it the proper parameters for it to work.

[Eranga]

Oops, I've made a mistake there. I didn't see the class definition. Really sorry about that. Unformatted codes mess me up. Sorry again.