The Java 2 Development Kit lets you write Java applets that conform to the latest applet API for Java. Previous versions added new functionality to Java, including accessibility, drag-and-drop, application services, a Java extensions framework, collections, input methods, version identification, reference objects, the Java interface definition language (IDL), the Java Virtual Machine Debugger Interface (JVMDI), Java servlets, and Javadoc doclets. Performance enhancements include native thread support, memory compression for loaded classes, faster memory allocation and garbage collection, monitor speed-ups, and a native library JNI port.