CharacterCode.java

import com.zeroleaf.util.Print;

/**
 * User: zeroleaf
 * Date: 13-9-30
 * Time: 12:13
 *
 * A class that demonstrate get the unicode code of a character
 * and encode a unicode code to a character.
 */
public class CharacterCode {

    public static void main(String[] args) {
        String message = "这是一则消息";
        int[] unicodeCodes = unicodeCode(message);
        String[] hexUnicodeCodes = hexUnicodeCode(message);

        System.out.println("Decimal unicode code is:");
        Print.println(unicodeCodes);
//        for (int i = 0; i < unicodeCodes.length; i++)
//            System.out.print(unicodeCodes[i] + ", ");
        System.out.println("\nHex unicode code is:");
        Print.println(hexUnicodeCodes);

        /* ---------------------------------- */

        System.out.println("\n");
        String original1 = encodeUnicodeCode(unicodeCodes);
        String original2 = encodeHexUnicodeCode(hexUnicodeCodes);
        System.out.println(String.format("original1 = %s, original2 = %s\t\t" +
                "original1 equals original2 is %b", original1, original2,
                original1.equals(original2)));

        /*
         *Output:
         * Decimal unicode code is:
         * 36825, 26159, 19968, 21017, 28040, 24687,
         * Hex unicode code is:
         * 8FD9, 662F, 4E00, 5219, 6D88, 606F,
         *
         * original1 = 这是一则消息, original2 = 这是一则消息		original1 equals original2 is true
         *
         */
    }

    /**
     * Get the unicode code of this character
     * @param c the character which you want to get the it's unicode
     * @return unicode code of this character
     */
    public static int unicodeCode(char c) {
        return c;
    }

    /**
     * Get the unicode code in hex string format of this character
     * @param c the character which you want to get the it's unicode
     * @return the unicode code in hex string format
     */
    public static String hexUnicodeCode(char c) {
        return Integer.toHexString(unicodeCode(c)).toUpperCase();
    }

    /**
     * Get the unicode code of each character in the string.
     * @param string the string which you want to get each character's unicode code.
     * @return a array that contains all the character's unicode code in the string.
     */
    public static int[] unicodeCode(String string) {
        int[] unicodeCodes = new int[string.length()];
        for (int i = 0; i < string.length(); i++) {
            unicodeCodes[i] = unicodeCode(string.charAt(i));
        }
        return unicodeCodes;
    }

    /**
     * Get unicode code in hex string value of each character in the string.
     * @param string
     * @return unicode code in hex string value of each character in the string
     *      and the order is the same as which in the string.
     */
    public static String[] hexUnicodeCode(String string) {
        String[] hexUnicodeCodes = new String[string.length()];
        for (int i = 0; i < string.length(); i++) {
            hexUnicodeCodes[i] = hexUnicodeCode(string.charAt(i));
        }
        return hexUnicodeCodes;
    }

    /**
     * Encode a (Decimal) unicode code to a character.
     * @param code the unicode code of a character
     * @return the character which unicode (Decimal) code is the given code
     */
    public static char encodeUnicodeCode(int code) {
        return (char) code;
    }

    /**
     * Encode a hex unicode code to a character
     * @param hexCode hex unicode code of a character
     * @return the character which hex unicode code is the given value
     */
    public static char encodeHexUnicodeCode(String hexCode) {
        return (char) Integer.parseInt(hexCode, 16);
    }

    /**
     * Encode a array of (Decimal) unicode code to a String object
     * @param codes a array that contains (Decimal) unicode codes
     * @return a String Object which character is encode from the array
     */
    public static String encodeUnicodeCode(int[] codes) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < codes.length; i++) {
            sb.append(encodeUnicodeCode(codes[i]));
        }
        return sb.toString();
    }

    /**
     * Encode a array of hex unicode code to a String object
     * @param vals a array that contains hex unicode codes
     * @return a String object which character is encode from the array
     */
    public static String encodeHexUnicodeCode(String[] vals) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < vals.length; i++) {
            sb.append(encodeHexUnicodeCode(vals[i]));
        }
        return sb.toString();
    }
}