java site exception list
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java exception handling: a tutorial on checked and unchecked exceptions
in java, exceptions are events that disrupt the normal flow of a program's execution. java categorizes exceptions into two main types: *checked exceptions* and **unchecked exceptions**. understanding these exceptions and how to handle them is crucial for building robust applications.
1. types of exceptions
1.1 checked exceptions
checked exceptions are exceptions that must be either caught or declared in the method signature using the `throws` keyword. they are checked at compile time. common examples include:
`ioexception`
`sqlexception`
`classnotfoundexception`
1.2 unchecked exceptions
unchecked exceptions do not need to be declared or caught. they are not checked at compile time. common examples include:
`nullpointerexception`
`arrayindexoutofboundsexception`
`arithmeticexception`
2. exception hierarchy
all exceptions in java are derived from the `throwable` class:
`throwable`
`error` (serious problems that applications should not catch)
`exception`
`checked exceptions`
`runtimeexception` (unchecked exceptions)
3. handling exceptions
java provides a robust mechanism for handling exceptions using `try`, `catch`, `finally`, and `throw`.
3.1 basic syntax
3.2 example of checked exception
here's an example that demonstrates handling a checked exception using `ioexception`.
3.3 example of unchecked exception
here's an example that demonstrates handling an unchecked exception using `nullpointerexception`.
4. creating custom exceptions
you can create your own exception classes by extending the `exception` class or one of its subclasses.
example of a custom exception
5. conclusion
java’s exception handling mechanism is powerful and flexible. by understanding checked and unchecked exceptions, you can write more resilient code. use checked exceptions for recoverable conditions and unchecked exceptions f ...
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