what is exeption handling in java

What is Exception handling in java programming?

An exception is an error generated by a Java application. The runtime may throw them, or any other application may throw them. A Java exception has three main parts: an error code, a message, and a throwable object that caused the error. The exception message includes information about the error, such as the method that caused the error. The throwable object may be a reference to a known exception (such as a FileNotFoundException), or may be a custom exception class. If an exception is not caught by a catch clause, then the exception is re-thrown. The Java Runtime may re-throw a thrown exception at a higher level in the stack.

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A throwable object is, in turn, divided into two categories: checked and unchecked. A checked exception indicates that the exception must be handled. It is the responsibility of the exception handler to determine how to handle the exception. A checked exception is the most specific exception a method can throw. By contrast, an unchecked exception indicates that the method has no special responsibility regarding the exception, and therefore the exception handler is free to ignore the exception as it would not bother to check it. A method can declare itself throws any exception. If it doesn’t specify any particular exception to be thrown by a particular method, then the runtime will throw a checked exception of the same name, with a message that is just the method’s name.

How to create custom exceptions and how to catch them?

An exception handler is usually written like this:

try {

// do some stuff }

catch(Exception e) {

// what to do if the error is caught

}

throwable is a custom exception class in java programming language, it’s used to define specific exceptions.

Exception Handling In Java. An exception is an error generated by a Java application. The runtime may throw them, or any other application may throw them. A Java exception has three main parts: an error code, a message, and a throwable object that caused the error. The exception message includes information about the error, such as the method that caused the error. The throwable object may be a reference to a known exception (such as a FileNotFoundException), or may be a custom exception class. If an exception is not caught by a catch clause, then the exception is re-thrown. The Java Runtime may re-throw a thrown exception at a higher level in the stack.