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In Java there are basically two types of exceptions: Checked exceptions and unchecked exceptions. C# only has unchecked exceptions. The differences between checked and unchecked exceptions are:

1. Checked exceptions must be explicitly caught or propagated as described in Basic try-catch-finally Exception Handling. Unchecked exceptions do not have this requirement. They don't have to be caught or declared thrown.
2. Checked exceptions in Java extend the java.lang.Exception class. Unchecked exceptions extend the java.lang.RuntimeException