Business software manufacturer Oracle has said it is in a deal to buy computer hardware and software maker Sun Microsystems for $7.4 billion.   The deal comes a month after IBM abandoned its bid to buy Sun, and Oracle said the buy "transforms the IT industry, combining best-in-class enterprise software and mission-critical computing systems."   Although best known for its computer servers, Sun was also the developer of the Java programming language, and created the Solaris operating system.

