How do you catch and handle an exception in Java?

"To catch an exception in Java you can use the standard try-catch control block (and optionally use the finally block to clean up any resources). Let’s take, for example, the simple task of reading input from a user using Scanner and manually parsing its value into an integer. If the user enters a non-numeric value, parsing will fail and result in a NumberFormatException that we can then catch and handle. For example:\n\nScanner s = new Scanner(System.in);\n\nint n = 0;\n\ntry {\n\nString input = s.next();\n\nn = Integer.parseInt(input);\n\n} catch (NumberFormatException nfe) {\n\nSystem.err.println(\"You entered invalid data!\");\n\nSystem.exit(1);\n\n}\n\nIn this example, we’ve simply displayed an error message to the standard error output and exited the program. That is, we’ve made the design decision that this error should be fatal. We could have chosen to handle this error differently in the catch block."