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    public static byte crc8 (String stringData)
    {
        int len = stringData.length();
        int i = 0;
        byte crc = 0x00;
        while (len-- > 0) {
            byte extract = (byte) stringData.charAt(i++);
            for (byte tempI = 8; tempI != 0; tempI--) {
                byte sum = (byte) ((crc & 0xFF) ^ (extract & 0xFF));
                sum = (byte) ((sum & 0xFF) & 0x01);
                crc = (byte) ((crc & 0xFF) >>> 1);
                if (sum != 0) {
                    crc = (byte)((crc & 0xFF) ^ 0x8C);
                }
                extract = (byte) ((extract & 0xFF) >>> 1);
            }
        }
        return crc;
    }
 
    public static void main (String args[])
    {
        String msg = "101011001";
        byte crc8result = crc8(msg);
 
        String s1 = String.format("%8s", Integer.toBinaryString(crc8result & 0xFF)).replace(' ', '0');
        System.out.println(s1); // 10000001
        String mesgWithCRC = msg + s1;
        System.out.println(mesgWithCRC);
 
        byte newCrc8Result = crc8(mesgWithCRC);
        String s2 = String.format("%8s", Integer.toBinaryString(newCrc8Result & 0xFF)).replace(' ', '0');
        System.out.println(s2); // 10000001
 
    }
 

Main.java:1: error: class, interface, or enum expected
    public static byte crc8 (String stringData)
                  ^
Main.java:4: error: class, interface, or enum expected
        int i = 0;
        ^
Main.java:5: error: class, interface, or enum expected
        byte crc = 0x00;
        ^
Main.java:6: error: class, interface, or enum expected
        while (len-- > 0) {
        ^
Main.java:8: error: class, interface, or enum expected
            for (byte tempI = 8; tempI != 0; tempI--) {
            ^
Main.java:8: error: class, interface, or enum expected
            for (byte tempI = 8; tempI != 0; tempI--) {
                                 ^
Main.java:8: error: class, interface, or enum expected
            for (byte tempI = 8; tempI != 0; tempI--) {
                                             ^
Main.java:10: error: class, interface, or enum expected
                sum = (byte) ((sum & 0xFF) & 0x01);
                ^
Main.java:11: error: class, interface, or enum expected
                crc = (byte) ((crc & 0xFF) >>> 1);
                ^
Main.java:12: error: class, interface, or enum expected
                if (sum != 0) {
                ^
Main.java:14: error: class, interface, or enum expected
                }
                ^
Main.java:16: error: class, interface, or enum expected
            }
            ^
Main.java:19: error: class, interface, or enum expected
    }
    ^
Main.java:21: error: class, interface, or enum expected
    public static void main (String args[])
                  ^
Main.java:24: error: class, interface, or enum expected
        byte crc8result = crc8(msg);
        ^
Main.java:26: error: class, interface, or enum expected
        String s1 = String.format("%8s", Integer.toBinaryString(crc8result & 0xFF)).replace(' ', '0');
        ^
Main.java:27: error: class, interface, or enum expected
        System.out.println(s1); // 10000001
        ^
Main.java:28: error: class, interface, or enum expected
        String mesgWithCRC = msg + s1;
        ^
Main.java:29: error: class, interface, or enum expected
        System.out.println(mesgWithCRC);
        ^
Main.java:31: error: class, interface, or enum expected
        byte newCrc8Result = crc8(mesgWithCRC);
        ^
Main.java:32: error: class, interface, or enum expected
        String s2 = String.format("%8s", Integer.toBinaryString(newCrc8Result & 0xFF)).replace(' ', '0');
        ^
Main.java:33: error: class, interface, or enum expected
        System.out.println(s2); // 10000001
        ^
Main.java:35: error: class, interface, or enum expected
    }
    ^
23 errors

Standard output is empty