The difference between int and integer. Is int or integer used in practical applications?

• int It's the basic data type ,integer Is the packaging data type ;
• in application , If your field needs to be set to null, For example, one field is the balance of ICBC card , If there is no ICBC card, you need to set the balance to null, Have a bank card but no money set to 0, Use this time integer type ; If there is no ICBC card and the balance is 0 Set to 0, use int Can . Mainly depends on demand ;
• If your business needs to use int, However, it is still necessary to distinguish between those without a bank card and those with a bank card but with a balance of 0, Then you only need to set the value of the field to -1 when , Represents no bank card , The field values for 0 when , The balance is 0 That's all right. .