Integer vs int:关于内存
我想知道是否有不同的内存占用整数 n 和 int n.
I was wondering if there is a difference in the memory occupied by
Integer n, and int n.
我知道int n正常占用4个字节，Integer n
I know int n occupies 4 bytes normally, how about Integer n
推荐答案
一般来说，Hotspot中Java对象使用的堆内存包括:
In general, the heap memory used by a Java object in Hotspot consists of:
- 一个对象头，由几个字节的管家"信息组成；
- 原始字段的内存，根据其大小(int n->32 位)
- reference 字段的内存(每个 4 字节)(整数 n ->32 位)
- 填充:在对象数据之后可能会浪费"一些未使用的字节，以使每个对象从一个方便的字节倍数的地址开始，并减少表示指向对象的指针所需的位数.
- an object header, consisting of a few bytes of "housekeeping" information;
- memory for primitive fields, according to their size (int n->32 bits)
- memory for reference fields (4 bytes each) (Integer n ->32 bits)
- padding: potentially a few "wasted" unused bytes after the object data, to make every object start at an address that is a convenient multiple of bytes and reduce the number of bits required to represent a pointer to an object.
根据 Mark Peters 的建议，我想添加下面的链接http://www.javamex.com/tutorials/memory/object_memory_usage.shtml
as per the suggestion of Mark Peters I would like add the link below http://www.javamex.com/tutorials/memory/object_memory_usage.shtml
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