Java方法的内存开销是多少？ [英] What is the memory overhead of a Java method?

问题描述

类中函数的内存开销是多少？

What is the memory overhead of a function in a class?

例如，

Class A
{
 int a
}

Class B
{
 int a
 int foo(int);
}

因此，A类的100个实例应该是80个字节。怎么样的B类100个实例？

So 100 instances of class A should be 80 bytes. What about 100 instances of class B?

推荐答案

开销是......无。

The overhead is... none.

方法定义和代码地址存储在Class对象中，该对象具有一个唯一的实例，对象的每个实例都指向该实例。
既然如此，无论你是否添加了这个方法，每个单独对象的开销都是空的。

The method definition and code address are stored in the Class object, which has a unique instance toward which every instance of your object points. Since that would be the case, whether or not you added that method, the overhead for each individual object is nothing.

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