First of all, there are two main ways to handle exceptions: one istry catch, and the other isthrows.
1. Put code that may cause exceptions in try catch
try{}. Put in catch{} the processing after catching the exception. Among them, the function ofe.printStackTrace()in catch is to print the location and reason of the program error on the console. Only when an exception occurs in the code in the try block will it go to the catch block.
Some exception captures will addfinally. Regardless of whether the exception in the try block is caught or not, the finally block will be executed at the end, unless there issystem.exit(( 0)(system.exit(0) is used to exit the virtual machine).
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2. Throw and throws
throwIt is a statement that throws an exception. It appears inside the function and is used to throw a specific exception instance. The statement after throw is executed has no effect and is transferred directly to the exception handling stage.
Examples are as follows:
throwsis a function method that throws exceptions. It is usually written in the head of the method to throw Some exceptions are not resolved by themselves, but are thrown to the caller of the method for resolution (try catch).
Examples are as follows:
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