Java convert string to int with exception11/23/2023 This kind of exception has to be handled. Reading a file can throw an exception - for example, the file might not exist or the program does not have read rights to the file. The code below reads the file given to it as a parameter line by line. We can handle exceptions by wrapping the code into a try-catch block or throwing them out of the method. ![]() There are exceptions we have to handle, and exceptions we do not have to handle. There are roughly two categories of exceptions. Methods and constructors can throw exceptions. If the resources are not closed, the operating system sees them as being in use until the program is closed. Now references to files can "disappear", because we do not need them anymore. The try-with-resources approach is useful for handling resources, because the program closes the used resources automatically. We use the try // do something with the lines Java will always let you know if your code has a statement or an expression which can throw an error you have to prepare for. We do not have to prepare for runtime exceptions, such as the NullPointerException, beforehand. ![]() Some exceptions we have to always prepare for, such as errors when reading from a file or errors related to problems with a network connection. For example, a program might call a method with a null reference and throw a NullPointerException, or the program might try to refer to an element outside an array and result in an IndexOutOfBoundsException, and so on. When program execution ends with an error, an exception is thrown. Know that some exceptions have to be handled and that some exceptions do not have to be handled.Know what exceptions are and how to handle them.
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