Java string intercept class distinguishes Chinese, English, numerals, punctuation

Package com.founder.fix.ims;

/**
* @author Wangyutao
* Manipulating strings
*/

public class SubString {

public static void Main (string[] args) {
String str = "I love Aston when the Grand Master Dafa God swore that the local times took place in the Grand Master Dafa Gold";
String str1 = "SDFDSSFSFDSF Dsdafdafafdsfadas";
SYSTEM.OUT.PRINTLN (mysubstring (str, 14));
System.out.println (Mysubstring (STR1, 14));
// }

/**
* Determine whether a character is a ascill character or another character (such as Han, Japanese, Korean characters)
*
* @param c
* @return
*/
public static Boolean Isletter (char c) {
int k = 0x80;
return (c/k) = = 0? True:false;
}

/**
* Gets the length of a string, the length of the display, a Chinese character or a Japanese-Korean length of 2, an English character length of 1
*
* @param String
* s, need to get the length of the string
* @return int, the resulting string length
*/
public static int Length (String s) {
if (s = = null) {
return 0;
}
Char[] C = S.tochararray ();
int len = 0;
for (int i = 0; i < c.length; i++) {
len++;
if (!isletter (C[i])) {
len++;
}
}
return Len;
}

/**
* Gets the length of a string, the length of the display, a Chinese character or a Japanese-Korean length of 1, an English character length of 0.5
*
* @param string s need to get length strings
* The string length obtained @return int
*/
public static double GetLength (String s) {
Double valuelength = 0;
String Chinese = "[\u4e00-\u9fa5]";
Gets the length of the field value, if it contains Chinese characters, the length of each Chinese character is 2, otherwise 1
for (int i = 0; i < s.length (); i++) {
Get a character
String temp = s.substring (i, i + 1);
Determines whether to be Chinese characters
if (Temp.matches (Chinese)) {
Chinese character length is 1
Valuelength + = 1;
} else {
Other character lengths are 0.5
Valuelength + = 0.5;
}
}
Carry rounding
Return Math.ceil (valuelength);
}

/**
* Intercept the length of a character, do not distinguish between Chinese and English, if the number is not exactly, then take one less character bit
*
* @author Patriotlml
* @param String
* Origin, original string
* @param int
* len, intercept length (a Chinese character length is 2)
* @return string, returned by strings
*/
public static string getsubstring (string origin, int len) {
if (origin = = null) | | origin.equals ("") | | (Len < 1)) {
Return "";
}
byte[] Strbyte = new Byte[len];
int relen = 0;
if (Len > Length (Origin)) {
return origin;
}
System.arraycopy (Origin.getbytes (), 0, strbyte, 0, Len);
int count = 0;
for (int i = 0; i < len; i++) {
int value = Strbyte[i];
if (value < 0) {
count++;
}
}
if ((count% 2)! = 0) {
Relen = (len = = 1)? ++len:--len;
}
return new String (strbyte, 0, Relen);
}
}

Java string intercept class distinguishes Chinese, English, numerals, punctuation