Reference

题目：

Implement the class ReferenceManager. Include the following two methods:

copyValue(Node obj). This would just copy the value from parameter obj to the public attribute node. But obj and node are still two difference instances / objects.
copyReference(Node obj). This would copy the reference from obj to node. So that both node and obj are point to the same object.

分析：

这是个可以帮助理解deep copy的好例子。

解法：

public class ReferenceManager {
    public Node node;

    public void copyValue(Node obj) {
        // copy value from obj to node
        node = new Node(obj.val);
    }

    public void copyReference(Node obj) {
        // copy reference from obj to node
        node = obj;
    }
}