The reference obj refers to an object stored in the heap.

o bj这个引用将引用堆中存储的一个对象。

youdao

As long as the obj reference exists, the garbage collector will never free the storage used to hold the object.

只要ob j引用还存在，垃圾收集器就永远不会释放用来容纳该对象的存储空间。

youdao

To take advantage of these reference classes, you must break the strong reference to the MyObject object by setting obj to null.

要利用这些引用类，您必须取消对MyObject对象的强引用，方法是将ob j设置为null。

youdao