Answer:
If there are no syntax errors, Java may detect an error while your program is running. You will get an error message telling you the kind of error, and a stack trace that tells not only where the error occurred, but also what other method or methods you were in. For example,
Exception in thread "main" java.lang.NullPointerException
at Car.placeInCity(Car.java:25)
at City.<init>(City.java:38)
at City.main(City.java:49)
Explanation:
