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1ÓÃJAVA×Ô´øµÄº¯Êý public static boolean?isNumeric(String?str){ for?(int?i?= str.length();--i>=0;){??? if?(!Character.isDigit(str.charAt(i))){ return false; ???} ??} return true; ?} 2ÓÃÕýÔò±í´ïʽ public static boolean isNumeric(String str){ ??? Pattern pattern = Pattern.compile("[0-9]*"); ??? return pattern.matcher(str).matches();??? ?} 3ÓÃasciiÂë 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; }