JDK is the core of the entire Java, including the Java Runtime Environment (Java runtime envirnment), a bunch of Java tools and the Basic Java class library (RT. Jar ). No matter what Java application server is actually built into a certain version of JDK. Therefore, mastering JDK is the first step to learn java well. The most popular JDK is the JDK released by Sun. In addition to sun, many companies and organizations have developed their own JDK, such as JDK developed by IBM and jrocket of Bea, and JDK developed by GNU. Among them, the JVM (Java Virtual Machine) Running Efficiency of ibm jdk is much higher than that of Sun JDK. The jrocket running on the X86 platform is much more efficient on the server than Sun JDK. However, we still need to Master Sun JDK first.
JDK (Java Development Kit, Java development kit, and Java development tools) is a program development environment for writing Java applets and applications. It consists of a running environment on the operating system layer and tools required by developers to compile, debug, and run applets and applications written in Java.
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