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    copied!<p>If you want your accented characters to always come after the normal ones, you can prepend an <code>@</code> in your defined rule for the <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/text/RuleBasedCollator.html" rel="nofollow">RuleBasedCollator</a>.</p> <blockquote> <p>The definitions of the rule elements is as follows: </p> <p>[...]</p> <p><strong>Modifier</strong>: There are currently two modifiers that turn on special collation rules. </p> <p>'<strong>@</strong>' : Turns on backwards sorting of accents (secondary differences), as in French. </p> <p>'<strong>!</strong>' : Turns on Thai/Lao vowel-consonant swapping. If this rule is in force when a Thai vowel of the range \U0E40-\U0E44 precedes a Thai consonant of the range \U0E01-\U0E2E OR a Lao vowel of the range \U0EC0-\U0EC4 precedes a Lao consonant of the range \U0E81-\U0EAE then the vowel is placed after the consonant for collation purposes. </p> <p>[...]</p> </blockquote> <p>So your sample code would look like follows:</p> <p>(I made the change only for the <code>ä</code> character, i.e. <code>@\u00e4, @\u00c4</code>)</p> <pre><code> String europeanRules = ("&lt; a,A ; \u00e0,\u00c0 ; \u00e1,\u00c1 ; \u00e2,\u00c2 ; \u00e3,\u00c3; @\u00e4,@\u00c4 ; \u00e5,\u00c5 ; \u00e6,\u00c6 "+ "; \u0101,\u0100 ; \u0103,\u0102 ; \u0105,\u0104 " + "&lt; b,B &lt; c,C ; \u00e7,\u00c7 ; \u0107,\u0106 ; \u0109,\u0108 ; \u010b,\u010a ; \u010d,\u010c " + "&lt; d,D ; \u010f,\u010e ; \u0111,\u0110 " + "&lt; e,E ; \u00e8,\u00c8 ; \u00e9,\u00c9 ; \u00ea,\u00ca ; \u00eb,\u00cb " + "; \u0113,\u0112 ; \u0115,\u0114 ; \u0116,\u0117 ; \u0119,\u0118 ; \u011b,\u011a " + "&lt; f,F &lt; g,G &lt; h,H " + "&lt; i,I ; \u00ec,\u00cc ; \u00ed,\u00cd ; \u00ee,\u00ce ; \u00ef,\u00cf " + "&lt; j,J &lt; k,K " + "&lt; l,L ; \u013a,\u0139 ; \u013c,\u013b ; \u013e,\u013d ; \u0140,\u013f ; \u0142,\u0141 " + "&lt; m,M &lt; n,N ; \u00f1,\u00d1 ; \u0144,\u0143 ; \u0146,\u0145 ; \u0148,\u0147 " + "&lt; o,O ; \u00f2,\u00d2 ; \u00f3,\u00d3 ; \u00f4,\u00d4 ; \u00f5,\u00d5 ; \u00f6,\u00d6 ; \u00f8,\u00d8 " + "; \u014d,\u014c ; \u014f,\u014e ; \u0151,\u0150 " + "&lt; p,P &lt; q,Q &lt; r,R ; \u0155,\u0154 ; \u0157,\u0156 ; \u0159,\u0158 " + "&lt; s,S ; \u015b,\u015a ; \u015d,\u015c ; \u015f,\u015e ; \u0161,\u0160 " + "&lt; t,T ; \u0163,\u0162 ; \u0165,\u0164 ; \u0167,\u0166 " + "&lt; u,U ; \u00f9,\u00d9 ; \u00fa,\u00da ; \u00fb,\u00db ; \u00fc,\u00dc ; \u0169,\u0168 ; \u016b,\u016a ; \u016d,\u016c " + "; \u016f,\u016e ; \u0171,\u0170 ; \u0173,\u0172 " + "&lt; v,V &lt; w,W ; \u0175,\u0174 " + "&lt; x,X &lt; y,Y ; \u00fd,\u00dd ; \u00ff ; \u0177,\u0176 ; \u0178 " + "&lt; z,Z ; \u017a,\u0179 ; \u017c,\u017b ; \u017e,\u017d"); RuleBasedCollator col = null; try { col = new RuleBasedCollator(europeanRules); } catch (ParseException e) { } col.setStrength(Collator.SECONDARY); col.setDecomposition(Collator.FULL_DECOMPOSITION); List&lt; String&gt; list = new ArrayList&lt;String&gt;(); list.add("ac"); list.add("äb"); list.add("aa"); list.add("af"); list.add("bb"); Collections.sort(list,col); System.out.println(list); </code></pre> <p>The output is:</p> <pre><code>[aa, ac, af, äb, bb] </code></pre>
 

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