Unchecked and runtime exceptions in java [duplicate]

Question

In Java, we have checked exceptions and unchecked exceptions. Also, we have runtime exceptions. My question is - Are all runtime exceptions unchecked exceptions and all unchecked exception are runime excepions? Means can these two words be used interchangeably?

Answer 1

All runtime exceptions (e.g. NullPointerException) are unchecked exceptions.

Since errors (e.g. StackOverflowError) are also unchecked exceptions, not all unchecked exceptions are runtime exceptions.

The Java Language Specifications define an unchecked exception: "The unchecked exception classes are the run-time exception classes and the error classes."