根据特定的ascii值进行过滤的java字符串

Question

how can be done in java, to check string to prompt error when

• string have special characters which have an EBCDIC value greater than hexadecimal “ 3F ” or
• an ASCII value greater than hexadecimal “ 1F ”. Occurrences of values EBCDIC “ 00 ” - “ 3F ” and ASCII “ 00 ” - “ 1F ” are not valid.

sorry if my question repeated or confuse

Thanks in advance

Answer 1

You can sort the String as is explained in this answer: Sort a single String in Java

char[] chars = original.toCharArray();
Arrays.sort(chars);

Once is sorted you only have to check that the last one in the array of chars is higher than your given hex value.

For EBCDIC you can add a comparator to the sort and order based on the EBCDIC instead.

    char[] chars = original.toCharArray();

    // I will convert my array of chars to array of Characters to use Arrays.sort   
    int length = Array.getLength(chars);


    Character[] ret = new Character[length];
    for(int i = 0; i < length; i++)
        ret[i] = (Character)Array.get(chars, i);

        // and now the important bit 
    Arrays.sort(ret, new Comparator<Character>() {

        @Override
        public int compare(Character arg0, Character arg1) {
            // convert arg0 and arg1 to EBCDIC with whatever tools you have
            return arg0InEBCDIC - arg1InEDBCIC;
        }
    });

Once you have an ordered array you just need to check the last element as I said.