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JVM说一下 JVM 的主要组成部分及其作用？总体来说，方法区和堆是所有线程共享的内存区域；而虚拟机栈、本地方法栈和程序计数器的运行是线程私有的内存区域，运行时数据区域就是我们常说的JVM的内存类加载子系统：根据给定的全限定名类名(如：java.lang.Object)来装载class文件到运行时数...

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