What is exception handling in Java interview questions?
Ans: The mechanism of handling unexpected errors in a java program is called exception handling. It is a powerful mechanism to handle runtime errors, ClassNotFoundException, FileNotFoundException, IOException, etc. so that the normal execution flow of the program can be maintained.
What is exception handling in Java with examples?
Exception handling ensures that the flow of the program doesn’t break when an exception occurs. For example, if a program has bunch of statements and an exception occurs mid way after executing certain statements then the statements after the exception will not execute and the program will terminate abruptly.
What are the 5 keywords in Java exception handling?
Customized Exception Handling: Java exception handling is managed via five keywords: try, catch, throw, throws, and finally.
How will you handle the exception in Java?
The try-catch is the simplest method of handling exceptions. Put the code you want to run in the try block, and any Java exceptions that the code throws are caught by one or more catch blocks. This method will catch any type of Java exceptions that get thrown. This is the simplest mechanism for handling exceptions.
Can we write try without catch?
Yes, It is possible to have a try block without a catch block by using a final block. As we know, a final block will always execute even there is an exception occurred in a try block, except System. exit() it will execute always.
Is catch block mandatory with try in Java?
only try block is mandatory. Please note that only try block is mandatory while catch and finally blocks are optional. With a try block, we can use either a catch block or finally block as needed.
Can we handle exception without catch block?
Yes, it is possible. You can use an uncaught exception handler. Its responsibility is to catch the exceptions that your program didn’t catch, and do something with it.
Can we use try without catch?
Is finally block mandatory in Java?
It is not mandatory to include a finally block at all, but if you do, it will run regardless of whether an exception was thrown and handled by the try and catch parts of the block. System. exit() is called.
What is difference between throw and throws?
The throws keyword is used to declare which exceptions can be thrown from a method, while the throw keyword is used to explicitly throw an exception within a method or block of code.
Can we write finally without catch?
Yes, it is not mandatory to use catch block with finally. You can have to try and finally.