Java uses Unicode encoding. The range of char type variables is 0-65535. Unsigned values can represent 65536 characters. Basically, all characters on the earth can be included.
Chinese characters are basically concentrated between [19968, 40869], with a total of 20901 Chinese characters.
unicode encoding range:
Chinese characters: [0x4e00,0x9fa5] (or decimal [19968,40869])
Numbers: [0x30,0x39] (or decimal [48 , 57])
Lowercase letters: [0x61,0x7a] (or decimal [97, 122])
Uppercase letters: [0x41,0x5a] (or decimal [65, 90])
The first method is to judge whether there are Chinese characters
public boolean checkcountname(String countname) { Pattern p = Pattern.compile("[\u4e00-\u9fa5]"); Matcher m = p.matcher(countname); if (m.find()) { return true; } return false; }
Use regular expressions to match
The second method is to judge whether the entire string is composed of Chinese characters
public boolean checkname(String name) { int n = 0; for(int i = 0; i < name.length(); i++) { n = (int)name.charAt(i); if(!(19968 <= n && n <40869)) { return false; } } return true; }
For more java knowledge, please pay attention to java basic tutorial.
The above is the detailed content of How to determine whether a string is Chinese in java. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version
Chinese version, very easy to use

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Atom editor mac version download
The most popular open source editor
