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Java exception handling interview questions and answers

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…

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Java String & Array limitations and OutOfMemoryError

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. The maximum value of an integer is Integer.MAX_VALUE,…

SQLException handling – recoverable & irrecoverable scenarios

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…

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Top 5 Core Java Exceptions and best practices

#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.

List<T> list = getListOfItems();
for (Iterator<T> iter = list.iterator(); iter.hasNext(); ) {
  T obj = iter.next();
  if (obj.someCondition()) {
    list.remove(0); // ConcurrentModificationException
  }
}

List<T> list = getListOfItems();

for (Iterator<T> iter = list.

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Java exception handling interview questions and answers

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Java String & Array limitations and OutOfMemoryError

SQLException handling – recoverable & irrecoverable scenarios

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Top 5 Core Java Exceptions and best practices

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