javafx checklistree output: the term inter comma - 


for (checkboxtreeitem<string> treeitem : treeitems) {      if (treeitem.isselected()) {          if (treeitem.getvalue() != null) {              konular = konular + treeitem.getvalue();          }               }          }  system.out.println(konular);

hi, code checktreeviews ,treelist sample1 sample2...

i have choice, output: nullsample3sample4

i want: sample3, sample4

the java 8 way:

string konular = treeitems     .stream()     .map(treeitem::getvalue)     .filter(value -> value != null)     .collect(collectors.joining(", "));

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