Enum – the base class for enumeration classes (as of J2SE 5.0).Object – the class that is the root of every class hierarchy.The main classes and interfaces in java.lang are: This package contains 22 of 32 Error classes provided in JDK 6. This includes the root classes that form the class hierarchy, types tied to the language definition, basic exceptions, math functions, threading, security functions, as well as some information on the underlying native system. The Java package java.lang contains fundamental classes and interfaces closely tied to the language and runtime system. The Java Runtime Environment (JRE) and Java Development Kit (JDK) are the actual files downloaded and installed on a computer to run or develop Java programs, respectively. Java Platform, Micro Edition (Java ME) is a related specification intended to provide a certified collection of Java APIs for the development of software for small, resource-constrained devices such as cell phones, PDAs and set-top boxes. Java Platform, Enterprise Edition (Java EE) is a related specification that includes all the classes in Java SE, plus a number that are more useful to programs that run on servers as opposed to workstations. ![]() Java SE 6 (Mustang) was released under JSR 270. JSR 59 was the umbrella specification for J2SE 1.4 and JSR 176 specified J2SE 5.0 (Tiger). Starting with J2SE 1.4 (Merlin), Java SE has been developed under the Java Community Process, which produces descriptions of proposed and final specifications for the Java platform called Java Specification Requests (JSR). The naming convention has been changed several times over the Java version history. ![]() The "2" was originally intended to emphasize the major changes introduced in version 1.2, but was removed in version 1.6. The "SE" is used to distinguish the base platform from the Enterprise Edition ( Java EE) and Micro Edition ( Java ME) platforms. The platform was known as Java 2 Platform, Standard Edition or J2SE from version 1.2, until the name was changed to Java Platform, Standard Edition or Java SE in version 1.5. Nomenclature, standards and specifications
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