preview

The Function Of Jav Exception Handling Code In Java

Decent Essays
Open Document

In java exception handling mechanism is based on following five keywords: 1) try 2) catch 3) finally 4) throws 5) throw Whenever an exception is occurred in a Java program, JVM assumes that there is no sense of keeping the program running until the exception is handled or being thrown to some other piece of code to handle it. In certain situations (In case of Checked Exceptions) Java compiler force the programmer to write a handling code to deal with exceptions. For example let’s assume we are having a code that reads from an external file, JVM expects some handling code for the situation if the required file is not available at the run time. This is how Java maintains its integrity against code failure by allowing the programmer to write …show more content…

In above example we are reading user’s input from the console, we have put the reading code in try catch because we don’t know if the user will type something or not, that is what handling code will do for us it will define an strategy to handle with unwanted or wrong input situation. try { String input = reader.readLine(); // Exception prone area System.out.println("You typed : "+input); } Now in case the input is not correct or not entered, the control will goes to catch block instantly. Here the thing to note down is that if an Exception occurs at any code line of try block, no further code in try block will be executed after that line. Every try block must have at least one catch or finally block with it, we will come to know about finally shortly. 2) catch in Java This is the part of try-catch where we can write code to deal with Exception conditions or some message or a stack trace of exception object to detect the exception reasons. catch (IOException e) { e.printStackTrace(); } We can have more than one catch block per try, each catch block is an exception handler that handles the type of exception that is being declared as its argument. The argument must be a class name inherited from Throwable class. try { String input = reader.readLine(); // Exception prone area System.out.println("You typed : "+input); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) {

Get Access
Related
Get Access