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. In practice, we hope to determine whether a character is a Chinese character, or whether the characters in a string have Chinese characters to meet business needs. There is a method in the String class to get the character length length(). See the example below.

String s1 = "我是中国人";  
String s2 = "imchinese";  
String s3 = "im中国人";  
System.out.println(s1+":"+new String(s1).length());  
System.out.println(s2+":"+new String(s2).length());   
System.out.println(s3+":"+new String(s3).length());

OUTPUT:

I am Chinese:5

imchinese:9

im中文:5

java determine characters Whether the string is Chinese:

/**
 * 判断该字符串是否为中文
 * @param string
 * @return
 */
public static boolean isChinese(String string){
    int n = 0;
    for(int i = 0; i < string.length(); i++) {
        n = (int)string.charAt(i);
        if(!(19968 <= n && n <40869)) {
            return false;
        }
    }
    return true;
}

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])

unicode Chinese range

Chinese character encoding range:\u4e00-\u9FA5

Double-byte character encoding range:\u0391-\ uFFE5

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

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