请问一小段代码
程序如下,请问 “String Chr = ""+Chrtmp;”有何用处?
public static boolean isNumber( String val ){
if (val==null) {return false;}
if (val.equals("")) {return false;}
for( int i = 0; i < val.length(); i++ ){
char Chrtmp = val.charAt(i);
String Chr = ""+Chrtmp;
if( !( Chr.compareTo("0") >= 0 && Chr.compareTo("9") <= 0 ) ) {
return false;
}
}
return true;
}