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Checked and Unchecked exceptions

 
Greenhorn
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What is the difference between checked and unchecked exception.

How to identify whether an exception is checked or unchecked.
Is RunTimeException checked or unchecked
 
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Checked exceptions are have to be handled at compile time, unchecked exceptions need to be handled at runtime. Checked exceptions subclass java.lang.Exception, unchecked exceptions subclass java.lang.RuntimeException. Here this can be a little confusing, since RuntimeException also extends Exception. The thinking is that unchecked exceptions are supposed to be more trivial (though this is not necessarily how it works in practice).
 
Don't get me started about those stupid light bulbs.
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