Induction can be used to prove that a recursive algorithm is correct.

IOExceptions are ________ exceptions (so you must catch or declare the ex-ception).

a. required b. important c. special d. checked

When an object is concatenated with a String, ________.

a. a compilation error occurs b. a runtime error occurs c. the object’s toString method is implicitly called to obtain the String representation of the object d. the object’s class name is concatenated with the String