Traversing through a custom List of Object java -


i have custom list of entity objects:

list<student> lststudents

the list has data database.

how traverse through list , output each data element/column.

i tried this:

for (final student s: lststudents)  {     outputtdcfile=outputtdcfile+s.getid();     system.out.println(s.getid()); } system.out.println(outputtdcfile);

i getting empty result.

issue seems system.out.println(outputtdcfile); though outputtdcfile variable populated values system.out.println fails print it.

enter image description here

i see these possibilities.

  1. lststudents empty
  2. getid() returns empty string
  3. standard output redirected

i think number 1 probable.

solution: either debug code breakpoints or use snippet see if lststudents contains processed.

if (lststudents.isempty()) {     system.out.println("lststudents empty"); } else {     system.out.println("lststudents not empty, problem elsewhere"); }  (final student s: lststudents)  {     outputtdcfile=outputtdcfile+s.getid();     system.out.println(s.getid()); } system.out.println(outputtdcfile);

if nothing displayed, might have problem standard output.


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