In order that Java can run smoothly on various platforms, the composition and running mechanism of the Java virtual machine are studied and a reference for implementing JVM and porting JVM to other platforms is provided.

• 为了使 Java在不同的平台上顺利运行 ；研究 Java虚拟机 (Java virtualmachine；简称 JVM)的组成及运行机制 ；为编程实现 JVM或向各种平台移植 JVM提供参考 .