How to determine whether a string is Chinese in java

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.

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