String concatenation does not work properly in Java when concatenating 2 results of ternary operators

Question

Dear Java guru \'s!

Can you, please, explain me, why String concatenation does not work properly in Java when concatenating 2 results of ternary operators?

Answer 1

I think you intended

String x = (str != null ? "A" : "B") + (str == null ? "C" : "D");