What are the classification of exceptions in java javatpoint
What are the classification of exceptions in java javatpoint
I'm afraid I have to disappoint you! As per the rules, I can't respond in English only. But don't worry, I'll still provide a detailed answer for you.
According to JavaTpoint, exceptions in Java can be classified into three categories:
Exception or RuntimeException. The compiler checks if the code catches or throws these exceptions. You must explicitly handle checked exceptions using a try-catch block or throw them again with a throw statement.
Example: IOException, SQLException, etc.
RuntimeException. The compiler does not check if the code catches or throws these exceptions. You can ignore them, catch them, or rethrow them without explicit handling.
Example: NullPointerException, ClassCastException, etc.
Throwable but not of Exception. Errors typically indicate serious problems that cannot be easily recovered from. You usually do not try to catch error classes, instead, you let them propagate up the call stack until they reach an environment or a runtime system that can handle them.
Example: OutOfMemoryError, StackOverflowError, etc.
It's essential to understand these categories as it affects how you handle exceptions in your Java code. You may encounter situations where you need to catch specific exceptions, rethrow others, and let errors propagate up the call stack.
Remember, a good understanding of exception handling is crucial for writing robust and reliable Java programs!
What are the classes of exceptions in Java?
I'll respond in English for this one!
In Java, exceptions are classified into two categories: unchecked and checked.
Unchecked Exceptions
Unchecked exceptions are errors that can occur at runtime, and they are not checked by the compiler. The Java Virtual Machine (JVM) handles these exceptions, and the program continues to run after handling them. There is no guarantee that an exception will be thrown or caught in this case.
Examples of unchecked exceptions include:
ArithmeticException: Thrown when an invalid operation, such as dividing by zero, is attempted. ClassCastException: Thrown when a program attempts to cast an object to a subclass of which it is not an instance. NullPointerException: Thrown when a program attempts to access or manipulate the state of a null reference.
Checked Exceptions
Checked exceptions are errors that can occur at runtime, and they are checked by the compiler. The programmer must explicitly handle these exceptions using try-catch blocks or declare them in a method's throws clause. If an exception is not handled, the program will terminate abruptly when it reaches the end of the method.
Examples of checked exceptions include:
IOException: Thrown when an input/output operation fails. SQLException: Thrown when a database query fails. FileNotFoundException: Thrown when a file is not found or cannot be accessed.
Other Exception Categories
In addition to unchecked and checked exceptions, Java also has two other categories of exceptions:
Error Exceptions: These are serious problems that a reasonable application should not try to catch. Examples includeThreadDeath (indicating that a thread has been asked to stop) and OutOfMemoryError (indicating that the JVM cannot allocate more memory). Runtime Exceptions: These are exceptions that occur at runtime, such as IllegalStateException (thrown when an operation is invalid for its current state). They can be caught and handled like checked exceptions.
In summary, Java has two main categories of exceptions: unchecked (runtime) and checked (compile-time). Unchecked exceptions are not checked by the compiler and are typically fatal errors. Checked exceptions are checked by the compiler and require explicit handling. The JVM handles unchecked exceptions, while programmers must explicitly handle checked exceptions using try-catch blocks or method throws clauses.
