Int and Long are basic data types, which can be converted into long and then generate long data.

The code is as follows:

Dragon? l？ =? New? long((long)3)； In this way, the int type can be successfully converted to the Long type.

Int stands for a class and is an integer class. In other words, you have to follow an integer. If it is a decimal, it will be reported as an incompatible type. Int has a wide range of values, from [-(3 1 to the second power)] to [+(3 1 to the second power)-1]. Int is usually enough, others such as short and long are rare, because they are object-oriented and related to objective reality. Long is generally only used for astronomical figures.