Origin and Development
ICU is descended from C++ frameworks produced by Taligent in the mid 1990s. Soon after Taligent became part of IBM in early 1996, Sun Microsystems decided that Java, then in its infancy, "was missing international support. Taligent had great international technology, talented engineers, and a location about 100 meters from Sun's JavaSoft division in Cupertino, California. IBM arranged for Taligent's Text and International group to contribute international classes to Sun's Java Development Kit." Some of the code for text processing, date formatting, etc., was rewritten in Java and became the JDK 1.1 internationalization APIs. A large portion of this code still exists in the java.text and java.util packages. Further internationalization features were added with each later release of Java.
IBM programmers then rewrote the Java internationalization classes in C++ and later ported some classes to C functions. The C++/C version of ICU is known as ICU4C. The ICU project also provides ICU4J ("ICU for Java"), which adds features not present in the standard Java libraries. ICU4C and ICU4J are kept as similar as possible, though not identical. For example, ICU4C includes a Regular Expression API. Both frameworks have been enhanced over time to support new facilities and new features of Unicode and CLDR. ICU was released as an open source project in 1999 under the name "IBM Classes for Unicode." It was later renamed to "International Components For Unicode."
Read more about this topic: International Components For Unicode
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