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| Difference between RuntimeException and checked Exception in Java Posted: 18 Dec 2012 06:24 AM PST RuntimeException vs Checked Exception in Java Java Exceptions are divided in two categories RuntimeException also known as unchecked Exception and checked Exception. Main difference between RuntimeException and checked Exception is that, It is mandatory to provide try catch or try finally block to handle checked Exception and failure to do so will result in compile time error, while in case of RuntimeException this is not mandatory. Difference between checked and unchecked exception is one of the most popular question on Java interview for 2 to years experienced developer especially related to Exception concepts. Answer to this question is rather similar as mentioned in previous lines and they are mostly asked along with other Java Exception interview questions like difference between throw and throws and Error vs Exception. Any Exception which is subclass of RuntimeException are called unchecked and mandatory exception handling is not requirement for them. Some of the most common Exception like NullPointerException, ArrayIndexOutOfBoundException are unchecked and they are descended from java.lang.RuntimeException. Popular example of checked Exceptions are ClassNotFoundException and IOException and that's the reason you need to provide a try catch finally block while performing file operations in Java as many of them throws IOException. Similarly many utilities of Reflection API throws java.lang.ClassNotFoundException. In this Java tutorial we will see some more difference between RuntimeException and checked Exception in Java. |
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