Java stringbuilder фильтр и те же линии
Set<String> tokens = new HashSet<String>(Arrays.asList(s.split("\n")));
StringBuilder resultBuilder = new StringBuilder();
boolean first = true;
for(String token : tokens) {
if(first) first = false;
else resultBuilder.append("\n")
resultBuilder.append(token);
}
String result = resultBuilder.toString();
Clumsy Crayfish