How many java exceptions are there in javatpoint

Bobby 153 Published: 10/19/2024

How many java exceptions are there in javatpoint

I'm happy to help!

According to the JavaTpoint website, which is a popular online resource for learning and practicing Java programming, there are numerous Java exceptions that can be categorized into different groups based on their types. In total, there are around 100+ Java exceptions, but I'll give you an overview of the main ones.

RuntimeException and its Subclasses

ArithmeticException: Thrown when a division by zero or any other invalid arithmetic operation occurs. ArrayIndexOutOfBoundsException: Thrown when trying to access an array with an out-of-bounds index. ArrayStoreException: Thrown when trying to store the wrong type of object in an array. ClassCastException: Thrown when trying to cast an object to a subclass that does not exist or has no inheritance relationship with the given class. ClassNotFoundException: Thrown when trying to load a class that cannot be found at runtime. InstantiationException: Thrown when trying to create an instance of a non-static inner class.

Error and its Subclasses

LinkageError: Thrown when a link between two pieces of code fails (e.g., a missing dependency). StackOverflowError: Thrown when the stack space is exhausted due to recursive method calls. UnknownError: A generic error that can occur during program execution.

Security and its Subclasses

AccessControlException: Thrown when trying to access a resource or perform an action that exceeds the permissions granted to the current user. AuthException: Thrown when authentication fails (e.g., invalid username/password). CertificateExpiredException: Thrown when a certificate has expired and cannot be trusted.

IOException and its Subclasses

FileNotFoundException: Thrown when trying to access a file that does not exist or is inaccessible. InterruptedIOException: Thrown when an I/O operation is interrupted by another thread. InvalidKeySpecException: Thrown when attempting to use an invalid key specification (e.g., incorrect password).

Networking and its Subclasses

ConnectException: Thrown when trying to connect to a host that cannot be reached or has been blocked. NoRouteToHostException: Thrown when there is no route available to the destination host.

Thread and its Subclasses

InterruptedException: Thrown when a thread is interrupted while waiting for an operation to complete. IllegalStateException: Thrown when trying to start a thread that has already been started or is not in a valid state. StackWalkerException: Thrown when there is an issue walking the call stack (e.g., invalid frame pointer).

Other Exceptions

These are just some of the main Java exceptions, which can be further grouped into categories like checked vs. unchecked exceptions. If you're interested in learning more about these exceptions and how to handle them in your Java code, I recommend exploring the official Java documentation or a reputable online resource.

I hope this helps!

What are the three categories of exceptions in Java?

In Java, there are several types of exceptions that can occur during the execution of a program. The main categories of exceptions are:

Checked Exceptions: These exceptions are checked by the compiler and must be either caught or declared to be thrown. Checked exceptions are subclasses of the Exception class, which is itself a subclass of the Throwable class. Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException. If your code does not handle a checked exception, the program will terminate with a runtime error.

try {
// code that may throw an IOException
} catch (IOException e) {
// handle the exception
}

Unchecked Exceptions: These exceptions are not checked by the compiler and do not need to be declared to be thrown. Unchecked exceptions are subclasses of the RuntimeException class, which is itself a subclass of the Exception class. Examples of unchecked exceptions include ArithmeticException, ArrayIndexOutOfBoundsException, and NullPointerException. Since these exceptions do not need to be explicitly caught or declared, they will only terminate the program if left unhandled.

try {
// code that may throw an ArithmeticException
} catch (ArithmeticException e) {
// handle the exception
}

Error Exceptions: These exceptions are also not checked by the compiler and do not need to be declared to be thrown. Error exceptions are subclasses of the Error class, which is itself a subclass of the Throwable class. Examples of error exceptions include OutOfMemoryError, StackOverflowError, and ThreadDeath. Like unchecked exceptions, these exceptions will only terminate the program if left unhandled.

try {
// code that may throw an OutOfMemoryError
} catch (OutOfMemoryError e) {
// handle the exception
}

It is worth noting that in Java, you can also create your own custom exceptions by extending either the Exception class for checked exceptions or the RuntimeException class for unchecked exceptions. This allows you to define specific error conditions and handling procedures for your application.

Handling exceptions correctly can be crucial in a robust software development process. It ensures that your code is more fault-tolerant, easy to debug, and better suited for real-world use cases where unexpected events may occur.