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Hello CUMTB
Java在编译的时候,会将最大操作数栈写入code属性中的max_stacks。不是 关键就是凭什么编译的时候就能知道最大操作数栈和局部变量表啊,很疑惑。这数据流分析这么强吗?
首先看这代码:
AtomicReference<Integer> reference = new AtomicReference<>(1000);
reference.compareAndSet(1000, 1001);
这里肯定是不能CAS成功的,因为这个1000的内存不是最开始的new AtomicReference<>(1000)的内存。
那问题来了,如果我们用这代码:
AtomicReference<Integer> reference = new AtomicReference<>(1000);
reference.compareAndSet(reference.get(), 1001);
使得成功CAS,那么想问的是此时的reference指向的内存空间是那个的呢?是原来new的1000还是新的1001所在的内存呢?
上下文线程如何实现和OSGI模块类似tomcat的加载原理
为什么Java再类加载过程中判断是否可以并行的时候。源码里面有个内部类叫做ParallelLoaders,里面有个方法叫做register。那个方法为什么再判断类加载器是否可以并行的同时还要判断父类加载器也要同时并行。但是它的静态代码块中已经添加进入了父类加载器了,也就是ClassLoader。那这算不算冗余呢???这是为了安全吗??? 这是为了架构吗???
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