对字符串内的字符进行排序

public class Anagram {

/**来自 
 n o w  j a v a  . c o m**/

    /**

     * Tests whether the passed-in strings are anagrams --

     * containing the exact same number of each letter.

     * Punctuation, case, and order don't matter.

     * 

     * @return true if the strings are anagrams; otherwise, false

     */

    public static boolean areAnagrams(String string1, String string2) {


        String workingCopy1 = removeJunk(string1);

        String workingCopy2 = removeJunk(string2);


        workingCopy1 = workingCopy1.toLowerCase();

        workingCopy2 = workingCopy2.toLowerCase();


        workingCopy1 = sort(workingCopy1);

        workingCopy2 = sort(workingCopy2);


        return workingCopy1.equals(workingCopy2);

    }/*来自 时   代    Java - nowjava.com*/


    /**

     * Removes punctuation & spaces -- everything except 

     * letters from the passed-in string.

     * 

     * @return a stripped copy of the passed-in string

     */

    protected static String removeJunk(String string) {

        int i, len = string.length();

        StringBuilder dest = new StringBuilder(len);

        char c;


        for (i = (len - 1); i >= 0; i--) {

            c = string.charAt(i);

            if (Character.isLetter(c)) {

                dest.append(c);

            }

        }


        return dest.toString();

    }


    /** 

     * Sorts the passed-in string.  

     * 

     * @return a sorted copy of the passed-in string

     */

    protected static String sort(String string) {

        char[] charArray = string.toCharArray();


        java.util.Arrays.sort(charArray);


        return new String(charArray);

    }


    public static void main(String[] args) {

        String string1 = "Cosmo and Laine:";

        String string2 = "Maid, clean soon!";


        System.out.println();

        System.out.println("Testing whether the following "

                + "strings are anagrams:");

        System.out.println("    String 1: " + string1);

        System.out.println("    String 2: " + string2);

        System.out.println();


        if (areAnagrams(string1, string2)) {

            System.out.println("They ARE anagrams!");

        } else {

            System.out.println("They are NOT anagrams!");

        }

        System.out.println();

    }

}