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    <p>You can create your own <code>Comparator</code> class/object and pass it to <code>Arrays.sort()</code>. Unfortunately, you also need to convert the elements to <code>Character</code>.</p> <p>However, perhaps the most general way is to see each character as a <code>String</code> and use a <code>Collator</code>, as in the following example:</p> <pre><code> // Rules separated in 3 parts only for convenience String rules1= "&lt; A &lt; B &lt; C &lt; D &lt; E &lt; F &lt; G &lt; H &lt; I &lt; J &lt; K &lt; L &lt; M &lt; N &lt; O &lt; P &lt; Q &lt; R &lt; S &lt; T &lt; U &lt; V &lt; W &lt; X &lt; Y &lt; Z" ; String rules2= "&lt; a &lt; b &lt; c &lt; d &lt; e &lt; f &lt; g &lt; h &lt; i &lt; j &lt; k &lt; l &lt; m &lt; n &lt; o &lt; p &lt; q &lt; r &lt; s &lt; t &lt; u &lt; v &lt; w &lt; x &lt; y &lt; z" ; String rules3= "&lt; 0 &lt; 1 &lt; 2 &lt; 3 &lt; 4 &lt; 5 &lt; 6 &lt; 7 &lt; 8 &lt; 9" ; RuleBasedCollator collator= new RuleBasedCollator(rules1+rules2+rules3) ; String input= "h498y948759hrh98A722hjDF94yugerTEr892ur48y" ; // Bulk of the job done here String[] arr= input.split("") ; Arrays.sort(arr,1,arr.length,collator); // Join back in a single string for presentation StringBuilder sb= new StringBuilder() ; for(String e: arr ) sb.append( e ); System.out.println(sb); </code></pre> <p>Output is</p> <pre><code> ADEFTeghhhhjrrrruuyyy222444457788888999999 </code></pre> <p>Changing only collation rules to</p> <pre><code> String rules1= "&lt; 0 &lt; 1 &lt; 2 &lt; 3 &lt; 4 &lt; 5 &lt; 6 &lt; 7 &lt; 8 &lt; 9" ; String rules2= "&lt; A,a &lt; B,b &lt; C,c &lt; D,d &lt; E,e &lt; F,f &lt; G,g &lt; H,h &lt; I,i &lt; J,j &lt; K,k &lt; L,l &lt; M,m &lt; N,n &lt; O,o &lt; P,p &lt; Q,q &lt; R,r &lt; S,s &lt; T,t &lt; U,u &lt; V,v &lt; W,w &lt; X,x &lt; Y,y &lt; Z,z" ; RuleBasedCollator collator= new RuleBasedCollator(rules1+rules2) ; </code></pre> <p>Output is</p> <pre><code> 222444457788888999999ADEeFghhhhjrrrrTuuyyy </code></pre> <p>The main advantage of <code>Collator</code>s is that they allow to sort multi-character Strings according to their internal rules. In fact, this is their main use case.</p> <p>Pretty powerful, eh? (Yes, I'm Canadian in case you didn't guess :-) )</p>
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    1. POhow to sort alphanumeric string and change sequence?
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    1. USVeronica Cornejo
    1. USVeronica Cornejo
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    1. COYes, though you'd have to convert the `char[]` to a `Character[]` first, since `Arrays.sort(char[])` does not have a version that uses a `Comparator` (since `Comparator` cannot work with primitive types).
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      1. USChris Jester-Young
    2. CO@ChrisJester-Young That's correct. Thanks.
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      1. USVeronica Cornejo
    3. CO+1 for using a collation-based approach; it's been a long time since I've seen any use of a collator. Also, I must be missing something; I don't see anything in your answer (except the last sentence) that might hint at your being Canadian, unless "pretty powerful, eh" is supposed to be a Canadian idiom or something. :-P (I'm a New Zealander, by the way.)
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