Java:本身的类和内存使用情况(例如:简单的二叉树实现)？

Question

例如，如果我上一个类:

class Node
{
    int myvalue;
    Node myparent;
}

节点“myparent”是对节点的引用，还是该节点的副本？如果它是对节点的引用，这意味着内存量将大约与我拥有的节点总数(包括它们的值)一样多，对吗？或者节点是节点的副本，因此所有节点占用的内存与其深度*(节点占用的内存量)一样多？

Answer 1

Java中所有非原始变量都是引用(实际上是指针)。从文档中可以清楚地看出这一点:

There are, correspondingly, two kinds of data values that can be stored in variables, passed as arguments, returned by methods, and operated on: primitive values (§4.2) and reference values (§4.3).

http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.1

The reference values (often just references) are pointers to these objects, and a special null reference, which refers to no object.

http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.3.1