Hutool tool class learning (continuous update)

https://www.hutool.cn/docs/#/

Type conversion Convert

• Convert to string ：int Turn the string , Array to string
• Convert to array of specified type ： An array of types to another type , for example string turn int
• Convert to date object ：String–>date
• Convert to set :
• Encoding conversion ：utf-8,GBK etc.
• Amount case conversion
• Digital conversion ： Numbers -》 english , Digital simplification , Numbers -》 chinese , Digital Chinese -》 Numbers
• Original class and wrapper class conversion （java There is no automatic packing , Unpacking mechanism ？）
• Custom type conversion , You can expand on your own

Date time

DateUtil

• Date,long,Calendar Mutual conversion between
• String to date
• Format date output
• obtain Date A part of an object
• Start and end time （ Zhou , month , year ……）
• Date time offset
• Date time difference
• Format time difference

DateTime

• Use DateTime Object can completely replace the development of Date Use of objects .

Lunar date -ChineseDate

• Traditional festivals , Heavenly stems and earthly branches

LocalDateTime

• in the light of JDK8+ date API Encapsulation , The functions of this tool class include LocalDateTime and LocalDate Parsing 、 format 、 transformation

Timer tool TimeInterval

• Hutool Through encapsulation TimeInterval Realize the timer function , That is, the execution time of the method or process can be calculated .

IO Stream correlation