Description: JDK is the core of Java, including Java runtime environment (Java Runtime Envirnment), a pile of Java tools and Java-based class library (rt.jar). Java application server regardless of the substance of what is a built-in version of the JDK. Grasp the JDK are therefore the first step to learn Java. JDK most mainstream companies are Sun' s JDK, except Sun, there are a lot of companies and organizations have developed their own JDK, such as IBM to develop the JDK, BEA' s Jrocket, also developed by GNU and so on JDK . IBM' s JDK contains one of the JVM (Java Virtual Machine) operating efficiency than the Sun JDK contains much higher than the JVM. Specifically x86 platform running on the server running Jrocket efficiency much better than the Sun JDK. But in any case, we still need to better grasp the Sun JDK first.
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