When strings are encoded in unicode, the string length calculation method finds out the range of Chinese characters represented in unicode encoding from “\u4E00” to “\u9FBB”. Since a Chinese character represents two characters, the following method can be used to calculate the length of strings

public static int getCharLength(String content) {
int count = 0;
for (int i = 0, len = content.length(); i < len; ++i) {
if ('u4E00' <= content.charAt(i) && 'u9FBB' >= content.charAt(i)) {
count++;
}
}
return content.length()+count;
}

Other coding methods can be calculated according to this principle