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  1. class Ideone {
  2. public static void main (String[] args) {
  3. String a = "a";
  4. String b = null;
  5. System.out.println((b == null ? "" : b) + a);
  6. }
  7. }
Success #stdin #stdout 0.11s 320576KB
stdin
Standard input is empty
stdout
a