多选题 What is the difference between an int and an Integer?
  • A. Nothing. They are both fully interchangeable.
  • B. An int is an object and Integer is a primitive. An int is fastest when performing calculations.
  • C. An int is a primitive and Integer is an object. An int is fastest when performing calculations.
  • D. This is a trick question. There is no such thing as an Integer.
  • E. This is a trick question. An Integer can be defined to be anything a developer wants it to be.
【正确答案】 C
【答案解析】int是一种基本数据类型，并且基本数据类型在执行运算时速度会更快。Integer是一个对象。大写字母I会帮助区分对象和基本数据类型。A、B、D和E不正确。