java.lang.NoSuchMethodError

[Siva kandasamy]

Hi there,
I have a simple code, causing run time exception, not sure why ?
Placed below, is the source code and error message:

  
// Shapes.java
      class Shape { }
      class Square extends Shape { }

      public class Shapes {
        public static void main(String[] args) {
          Square sq = new Square();
        }
      } ///:~

Error Message:
=============
% javac Shapes.java
% java Shapes
Exception in thread "main" java.lang.NoSuchMethodError: Shape: method <init>()V not found
at Square.<init>(Shapes.java:4)
at Shapes.main(Shapes.java:9)

[Rocky Summers]

you need to put a default constructor for your Shapes.java

 
// Shapes.java
class Shapes {
   Shapes() {
       // default constructor
   }
} 

[Rocky Summers]

oh yeah, you need to name your class the same name as your file. eg: Shape.java, you MUST name your class Shape...

[Siva kandasamy]

Thanks to you all.
I figured out, this is due to the collision.
Now it works fine.
thanks
siva