JDK (Java Development Kit)

JDK (Java Development Kit) is a Sun Microsystems product for Java developers. Since its inception Java, JDK has become the most widely used Java SDK. Is the core of the Java JDK, including Java runtime environment, Java tools and Java-based library. The first step is to learn the Java JDK. Specifically to run on x86 platform Jrocket efficiency in the service side also much better than the Sun JDK. SUN's JDK5.0 from the beginning, providing a generic and other very useful features, and its updated versions, operating efficiency has been a very large increase.VersionSE (J2SE), standard edition, standard edition, is usually a version of the JDK 5.0 from the start, renamed Java SE.EE (J2EE), enterprise edition, enterprise edition, use this JDK to develop J2EE applications, starting from JDK 5.0, renamed Java EE.ME (J2ME), micro edition, mainly for mobile devices, embedded devices, java application, starting from JDK 5.0, renamed Java ME.
 No JDK, then, can not install or run eclipsecharacteristics of the various versions of jdk1997 Servlet JSP technology generation and followed by the generation of Java against PHP, ASP server-side language, so bring chips. 1998, Sun released the EJB1.0 standard, bringing the three core J2EE platform technologies have emerged. Thus, in 1999, Sun released the first version of J2EE. And the end of 1999 released J2EE1.2, released in 2001 J2EE1.3, 2003 was released in J2EE1.4. 2.J2EE1.3 J2EE1.3 architecture, which consists mainly of the Applet container, Application Client container, Web container and EJB container, and includes a Web Component, EJB Component, Application Client Component, the JMS, JAAS, JAXP, JDBC, JAF, JavaMail, JTA and other technologies as the foundation. 1.3 introduces several noteworthy features: Java Message Service (JMS defines a set of API), J2EE connector technology (as defined in the extension services to non-J2EE application standard J2EE), XML parser, a set of Java API, Servlet2.3, JSP1.2 also been expanded and optimized performance, the new CMP component model and MDB (Message Bean).3.J2EE1.4 J2EE1.4 general framework and is consistent J2EE1.3, 1.4 adds support for Web services, mainly Web Service, JAX-RPC, SAAJ, JAXR, but also to an EJB message-passing mechanism perfect (EJB2.1), enhanced deployment and management tools (JMX), and the new version of the Servlet2.4 and JSP2.0 make Web applications easier.
4.JAVA EE 5JAVA EE 5 has many noteworthy features. One of them is the new Java Standard Tag Library (JSTL) 1.2 specification. JSTL 1.2 is the key to a unified expression language, it allows us to JavaServer Faces (JSF) in combination with the best features of JSTL.