What will happen if the io stream is not closed in java?

First of all, we all know that when we create a new java stream object, not only an instance object of the corresponding class is created in the computer memory. Moreover, it also occupies corresponding system resources, such as file handles, ports, database connections, etc.

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The instance object in the memory, when there is no reference to it, the java garbage collector It will be automatically recycled according to the corresponding policy, but the system resources cannot be released. Therefore, we need to actively call the close() method to release the java stream object.

After java7, you can use the try-with-resources statement to release the java stream object, thus avoiding the cumbersome try-catch-finally statement, especially in the finally subclass In the sentence, the close() method will also throw an exception.

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