Question

Example:

String wholeString = 
"Typical models for star formation assume that every type of galaxy produces stars"

I’d like to store the splitted string and its following (+1) String in a treemap:
with windowSize = 4 (predefined):
Typi,ypic -> put into TreeMap
ypic,pica -> put into TreeMap

for windowSize = 2 it would look like this:
Ty,yp -> TreeMap

and so on.

My code so far:

    Map<String, String> generateMap = new TreeMap<String, String>();

    for (int i = 0; i < wholeString.length(); i++) {
        generateMap
                .put((wholeString.substring((i),
                        Math.min((i + windowSize), wholeString.length()))),
                        (wholeString.substring(
                                (i + 1),
                                (Math.min((i + windowSize),
                                        wholeString.length())))));

    }

If I sysprint it, I gets this:
{ Augen=Augen, Außen=Außen, Innen=Innen, Jauch=Jauch,and so on

Answer 1

My take:

final String wholeString =
  "Typical models for star formation assume that every type of galaxy produces stars";
final int windowSize = 4;
final Map<String, String> generateMap = new LinkedHashMap<String, String>();

final int limit = wholeString.length() - windowSize;
for (int i = 0; i < limit;) generateMap.put(
      wholeString.substring(i, i + windowSize),
      wholeString.substring(++i, i + windowSize));

for (Map.Entry<String, String> e : generateMap.entrySet())
  System.out.println(e.getKey() + " -> " + e.getValue());