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This article introduces you to ICU4J specifically what to do, the content is very detailed, interested friends can refer to, I hope to help you.

ICU(International Components for Unicode) is a mature and widely used collection of C/C++ and Java libraries that provide Unicode and globalization support for software applications, and can achieve consistent results on C/C++ and Java software on all platforms.

What exactly does ICU4J do?

ICU was first developed by Taligent, which was merged into the Unicode Research Group of IBM's Global Certification Center, and ICU continued to be developed by IBM in collaboration with open source organizations. At first ICU was only a Java platform version, and later ICU classes under this platform were absorbed into JDK 1.1 developed by SUN, and were continuously improved in later versions of JDK. ICU under C++ and C platforms is ported from ICU under JAVA platform. The ported version is called ICU4C to support international applications under C/C++ platforms. ICU4J and ICU4C are not very different, but since ICU4C is open source and closely follows the Unicode standard, the Unicode standard supported by ICU4C is always the latest; at the same time, because of the release requirements of ICU4J and JDK binding on JAVA platform, ICU4C supports Unicode standard changes much faster than ICU4J.

The main functions of ICU are:

Code page conversion: The conversion of text data from Unicode to almost any other character set or encoding. ICU's transformation tables are based on character set data collected by IBM over decades and are among the most complete anywhere in the world.

Collation: Compare word strings according to regulations and standards for a particular language, region, or country. ICU collations are based on Unicode collation algorithms plus locale-specific comparison rules from the Common culture data repository.

Format: Format numbers, currency, time, date, and interest rates according to the conventions of the selected locale. include converting month and day name into that chosen language, choosing appropriate abbreviations, sorting field correctly, and so on. This data is also taken from a common regional data warehouse.

Time Calculation: Provides multiple calendars based on the traditional Gregorian calendar. Provides a complete set of time zone calculation APIs.

Unicode support:ICU follows closely the Unicode standard, providing easy access to many of the Unicode character attributes, Unicode normalization, case conversion, and other basic operations specified by the Unicode standard.

Regular Expressions:ICU's regular expressions fully support Unicode and are very competitive.

Bidi: Supports the processing of mixed scripts written in different order (e.g. English written from left to right, or Arabic and Hebrew written from right to left).

Text boundary: Locating a word, sentence, or paragraph position within a paragraph of text, or identifying a wrapping position that is best suited for displaying text.

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