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This article introduces the knowledge of "what are the new features of Java7 exception handling". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In a program, errors may occur in a variety of situations that the programmer did not expect, or environmental factors beyond the programmer's control, such as bad data of the user, trying to open a file that does not exist, and so on. In java, some of the errors that may occur while the program is running are called exceptions. An exception is an event that occurs during the execution of a program, which interrupts the normal instruction stream of the program being executed.

Catch exception

Multiple exception traps are provided in java7

Try {} catch (IndexOutOfBoundsException | NumberFormatException e) {System.out.println ("Array out of bounds...");} custom exception

Most of the exceptions that occur during programming can be described using java's built-in exception classes. In addition, users can customize exceptions according to their business.

Using custom exception classes in a program can be divided into the following steps:

1. Create a custom exception class

2. Throw an exception object through the throw keyword in the method

3. If you handle an exception in the current method that throws an exception, you can use the try-catch statement block to catch and handle the exception. Otherwise, you can use the throws keyword at the method declaration to indicate that the exception is to be thrown to the method caller and handle the exception.

Java7 automatically shuts down resources

Java7 enhances the try statement by allowing the try keyword to be followed by a pair of parentheses, which can declare and initialize one or more resources that will be automatically closed at the end of the try statement.

Exception inheritance system

Exceptions are classified as exceptions (Exception) and errors (Error), both of which are inherited from the Throwable parent class.

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