What are the three major versions of Java?

The Java2 platform includes three versions: Standard Edition (J2SE), Enterprise Edition (J2EE) and Micro Edition (J2ME):

• Standard Edition (Standard Edition) J2SE includes those components Classes at the core of the Java language.

• For example: database link, interface definition, input/output, network programming

• Enterprise Edition (Enterprise Edition) J2EE includes the classes in J2SE and also includes classes for developing enterprise-level applications.

• For example: EJB, servlet, JSP, XML, transaction control

• Micro Edition (micro version) J2ME includes A subset of J2SE used for software development of consumer electronics products.

• For example: pager, smart card, mobile phone, PDA, set-top box

Their scope is: J2SE is included in J2EE , J2ME contains the core classes of J2SE, but some newly added proprietary classes have different application scenarios and API coverage.

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