如何存储实例方法 [英] How are instance methods stored

问题描述

可能重复：

内存中的Java / C＃方法表示

I想知道如果我在java中有一个对象，它是如何存储的实例方法？一个对象有没有指向它的实例方法？

I was wondering if i have an object in java, how are it's instance methods stored? Does an object have a pointer to it's instance methods?

示例：

public class MyObject {
 private int x;
 private int y;
 [..]
}

如果我计划很多（A这些 MyObject 在内存中，如果除了x的getter和yi定义一个实例方法之外，它将在内存方面产生重大的区别计算总和？

If i plan keeping a lot (A big tree of objects for example) of these MyObjects in memory, will it make a significant difference in memory terms if apart from a getter for x and for y i define an instance method calculating the sum?

我正在尝试整理，我应该添加更多的实例方法或使用getter和setter在另一个类中进行计算。

I'm trying to sort out wether i should add more instance methods or doing the calculations in another class using the getters and setters.

推荐答案

对象需要其属性的内存（注意：对于对象，存储的属性是指向真实对象的指针，位于内存的其他位置）。方法（代码）不需要额外的内存，因为它们与类一起存储。

The object needs memory for its attributes (NOTE: for object, the attribute stored is a pointer to the real object, which lies elsewhere in memory). No additional memory is needed for methods (code) as they are stored with the class.

IE：

public class MyClass1 {
  private int myNumber;
}

和

public class MyClass2 {
  private int myNumber;
  public int MyMethod1() {
  }
  public int MyMethod2() {
  }
  public int MyMethod3() {
  }
  ....
  public int MyMethod1000() {
  }
}

每个实例使用相同的内存。

use the same memory per instance.

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