Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Ashok Kumar>cd "C:\Program Files\Java\jdk1.7.0_25\bin"

C:\Program Files\Java\jdk1.7.0_25\bin>keytool -genkey -keyalg rsa -alias Circle.class
Enter keystore password: ashok
What is your first and last name?
  [Unknown]:  T. Ashok Kumar
What is the name of your organizational unit?
  [Unknown]:  Department of Bioinformatics
What is the name of your organization?
  [Unknown]:  Noorul Islam College of Arts and Science
What is the name of your City or Locality?
  [Unknown]:  Kumaracoil, Thuckalay
What is the name of your State or Province?
  [Unknown]:  Tamil Nadu
What is the two-letter country code for this unit?
  [Unknown]:  IN
Is CN=T. Ashok Kumar, OU=Department of Bioinformatics, O=Noorul Islam College of Arts and Science, L="Kumaracoil, Thuckalay", ST=Tamil Nadu, C=IN correct?
  [no]:  yes

Enter key password for <Circle.class>
        (RETURN if same as keystore password): ashok

C:\Program Files\Java\jdk1.7.0_25\bin>keytool -export -alias Circle.class -file Circle.crt
Enter keystore password: ashok
Certificate stored in file <Circle.crt>

C:\Program Files\Java\jdk1.7.0_25\bin>