Java，两个对象，object1 = object2 = class / type ...不明白

Question

I have two instance variables, head and tail. In the code there's a line:

head = tail = new Node<E>();

Does this mean that there are two instances, head and tail, of class Node? I'm quite confused here.

Answer 1

It simply means:

tail = new Node<E>();
head = tail;

So there are 2 references ( head and tail ) pointing to the same Node<E> instance.

Answer 2

This means there are TWO references to ONE Object Node .

The line tail = new Node<E>(); actually returns a value (in this case an object reference) equal to the assigned value.

Answer 3

不，只创建了一个Node<E> 实例 ，但head和tail引用它，因此你有两个指向同一个对象的引用变量。

Answer 4

Only one instance of Node . Both head and tail references pointing to same instance.

Answer 5

No certainly not.

Here's what's happening in this code, in sequence.

1. 'new' is used to create an instance, aka an object, of the Node class
2. a reference to this instance is stored in the tail reference
3. a reference to this instance is stored in the head reference.

Answer 6

2个引用head和tail都分配给同一个Node实例。

Answer 7

只创建了一个对象，head和tail都引用了同一个对象。

Answer 8

object1=object2 ;

Here Object1 one refrence to other means simply object2 is copied all addresses to object1 reference

Simply object2 is copied into object1