Java determines whether a Chinese character is garbled to determine whether a string is a double integer number

/**
  * Determine if it is a Chinese character
  * 
  * @param str
  * @return
  */
 public Static Boolean ISGBK (String str) {
  char[] chars = Str.tochararray ();
  boolean ISGBK = false;
  for (int i = 0; i < chars.length; i++) {
   byte[] bytes = ("" + chars[i]). GetBytes () ;
   if (Bytes.length = = 2) {
    int[] ints = new int[2];
    ints[0] = bytes[0] & 0xff;
    ints[1] = bytes[1] & 0xff;
    if (ints[0] >= 0x81 && ints[0] <= 0xFE && ints[1] >= 0x40
 & nbsp;    && ints[1] <= 0xFE) {
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;ISGBK = true;
     break;
    }
   }
  }
  return ISGBK;
 }

/**
  * To determine if it is garbled
  * 
  * @param str
  * @return
  */
 public Static Boolean Ismessycode (String str) {
  for (int i = 0; i < str.length (); i++) {
   c Har C = Str.charat (i);
   //when converting from Unicode encoding to a character set, if there is no corresponding encoding in that character set, you get 0x3f (that is, the question mark character?)
   // When converting from another character set to a Unicode encoding, if the binary number does not identify any characters in the character set, the result is 0xfffd
   //system.out.println ("---" + (int ) c);
   if (int) c = = 0xfffd) {
    //there is a garbled
    // System.out.println ("There is garbled" + (int) c);
    return true;
   }
  }
  return false; 
 }

/**
* Determines whether a string is a double integer number
*
* @param str
* @return
*/
public static Boolean isdouble (String str) {
if (Stringutil.isnullorempty (str)) {
return false;
}
Pattern p = pattern.compile ("-*\\d*.\\d*");
Pattern p = pattern.compile ("-*" + "\\d*" + ".") + "\\d*");
return P.matcher (str). matches ();
}

/**
* Determines whether the string is an integer word
*
* @param str
* @return
*/
public static Boolean isnumber (String str) {
if (Stringutil.isnullorempty (str)) {
return false;
}
Pattern p = pattern.compile ("-*\\d*");
return P.matcher (str). matches ();
}

/**
* Judging whether it is a number
*
* @param str
* @return
*/
public static Boolean isnumeric (String str)
{
Pattern pattern = Pattern.compile ("[0-9]*");
Matcher isnum = Pattern.matcher (str);
if (!isnum.matches ()) {
return false;
}
return true;
}

Need to import Java.util.regex.Pattern and Java.util.regex.Matcher

From:http://hi.baidu.com/zdz8207/item/13abe809f904c718eafe38d5

Java determines whether a Chinese character is garbled to determine whether a string is a double integer number