A statement to determine whether a string contains Chinese characters and whether it is a number (LP)

Java: determines whether the loginname contains Chinese characters.

If (loginname. getbytes (). length! = Loginname. Length ()){
// Contains Chinese characters.

} Else {

// Does not contain Chinese characters.

}

Extension:Java three methods to determine whether a string is a number

1> use Java built-in functions
Public static Boolean isnumeric (string Str ){
For (INT I = Str. Length (); -- I> = 0 ;){
If (! Character. isdigit (Str. charat (I ))){
Return false;
}
}
Return true;
}

2> use regular expressions
Public static Boolean isnumeric (string Str ){
Pattern pattern = pattern. Compile ("[0-9] *");
Return Pattern. matcher (STR). Matches ();
}

3> use ASCII code

Public static Boolean isnumeric (string Str ){
For (INT I = Str. Length (); -- I> = 0 ;){
Int CHR = Str. charat (I );
If (CHR <48 | CHR> 57)
Return false;
}
Return true;
}