Description Uwe Peuker 2013-10-15 03:37:13 EDT

Demonstrated here (only demonstration, the real code had been more complex):

void testFunction(final boolean check) {

   String data = null;
   if (check) {
      data = "Checked";
      System.err.println(data == null ? "NULL" : data);
   } else {
      data = "Unchecked";
      System.err.println(data == null ? "NULL" : data);
   }
}

Steps:
1. Select "data == null ? "NULL" : data"
2. Choose "Refactor"->"Extract local variable"
3. Will be result in:

void testFunction(final boolean check) {

   String data = null;

   String x = data == null ? "NULL" : data;
   if (check) {
      data = "Checked";
      System.err.println(x);
   } else {
      data = "Unchecked";
      System.err.println(x);
   }
}

The assignment of data will be dismissed in the result printed on "err" stream.