如何查看应用程序正在使用的当前堆大小？ [英] How to view the current heap size that an application is using?

问题描述

我想我增加了我的堆大小为1 GB的NetBeans，因为我改变了配置看起来是这样的：

I think I increased my heap size to 1 GB in NetBeans since I changed the config to look like this:

netbeans_default_options="-J-Xmx1g ......

重新启动NetBeans后，我能确定吗？我的应用程序现在是1 GB？

After I restarted NetBeans, can I be sure that my app is given 1 GB now?

有没有办法验证这个？

推荐答案

使用此代码：

// Get current size of heap in bytes
long heapSize = Runtime.getRuntime().totalMemory(); 

// Get maximum size of heap in bytes. The heap cannot grow beyond this size.// Any attempt will result in an OutOfMemoryException.
long heapMaxSize = Runtime.getRuntime().maxMemory();

 // Get amount of free memory within the heap in bytes. This size will increase // after garbage collection and decrease as new objects are created.
long heapFreeSize = Runtime.getRuntime().freeMemory(); 

它是对我来说很有用t。

It was useful to me to know it.

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