Java determines whether a character is a Chinese character

java can use regular expressions to determine

/**
     * 判断一个字符是否是汉字
     * PS：中文汉字的编码范围：[\u4e00-\u9fa5]
     *
     * @param c 需要判断的字符
     * @return 是汉字(true), 不是汉字(false)
     */
    public static boolean isChineseChar(char c) {        
             return String.valueOf(c).matches("[\u4e00-\u9fa5]");
    }

Example:

/**
 * 判断一个字符是否是汉字
 *
 * @author Yawei Xi
 * @date 2018-8-20
 */
public class Test {
    public static void main(String[] args) {
        char a = ' ';
        char b = 0;
        char c = 'a';
        char d = '中';

        System.out.println(isChineseChar(a));
        System.out.println(isChineseChar(b));
        System.out.println(isChineseChar(c));
        System.out.println(isChineseChar(d));
    }

    /**
     * 判断一个字符是否是汉字
     * PS：中文汉字的编码范围：[\u4e00-\u9fa5]
     *
     * @param c 需要判断的字符
     * @return 是汉字(true), 不是汉字(false)
     */
    public static boolean isChineseChar(char c) {
        return String.valueOf(c).matches("[\u4e00-\u9fa5]");
    }
}

Test result:

false
false
false
true

Chinese characters are basically concentrated between [19968, 40869], 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])

Capital letters: [0x41,0x5a] (or decimal [65, 90])

For more java knowledge, please pay attention to java basic tutorial.

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