哈希图 <Integer, Object> 获取方法

Question

I understand that the java.util.HashMap can only accept Objects as keys and thus cannot accept a primitive int but instead only accepts Integer objects.

When using the get method to retrieve the value by using the key as a parameter must you put in an Integer object? Or will a primitive int suffice here?

Answer 1

In Java 5+ a primitive int will be autoboxed into an Integer , so it's safe to use it; prior to this you'll need to use an object