Q1. What is the difference between a runtime exception and a checked exception?
A1. You must either catch or throw a checked exception. The unchecked exception (aka Runtime exception) does not have to be explicitly handled.
Q. So, when to use checked exception,
…
Q1. What is the maximum possible length of a Java String & how much heap space do you need to store the maximum possible String object?
A1. A Java String internally uses a char array (i.e. char[]) and the indices of an array is an integer.
…
Q1. What is wrong with SQLException? A1. When a SQLException occurs, you do not necessarily know what went wrong. It could be a temporary failure that correct itself with time like a database deadlock or rebooting server OR a permanent fault like bad SQL or missing columns in a table...
#1: ConcurrentModificationException Getting a ConcurrentModificationException when trying to modify (i.e. adding or removing an item) a collection while iterating. The following code throws a ConcurrentModificationException. To avoid ConcurrentModificationException in a single-threaded environment, you can remove the object that you are working on with the iterator. … Read more ›...