Formatar datas

Um exemplo usando o SimpleDateFormat (verifique os formatos):
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   1.         SimpleDateFormat formatIso = new SimpleDateFormat("yyyy-MM-dd");  
   2.         SimpleDateFormat formatOut = new SimpleDateFormat("dd-MM-yyyy");  
   3.         String str = "2004-10-06";  
   4.         Date date;  
   5.         try {  
   6.             date = formatIso.parse(str);  
   7.             System.out.println(formatOut.format(date));  
   8.         } catch (ParseException e) {  
   9.             e.printStackTrace();  
  10.         }

new SimpleDateFormat("dd/MM/yyyy").format(new Date());