Question: What do you mean by checked exception in Java?

What are checked exceptions give an example?

Checked Exceptions

In general, checked exceptions represent errors outside the control of the program. For example, the constructor of FileInputStream throws FileNotFoundException if the input file does not exist. Java verifies checked exceptions at compile-time.

Why we use checked exception?

Checked Exceptions should be used for predictable, but unpreventable errors that are reasonable to recover from. Unchecked Exceptions should be used for everything else.

Is NullPointerException checked or unchecked?

Answer: NullPointerException is not a checked exception. It is a descendant of RuntimeException and is unchecked.

How do you handle checked exception?

Handling checked exceptions

  1. 1.By using a try block and catching the exception in a handler and dealing with it.
  2. 2.By using a try block and catching the exception in a handler, but throwing another exception that is either unchecked or declared in its throws clause.

What is difference between error and exception?

Errors mostly occur at runtime that’s they belong to an unchecked type. Exceptions are the problems which can occur at runtime and compile time. It mainly occurs in the code written by the developers.

Can we use throws for unchecked exception?

2.2. Can throw checked and unchecked exceptions. We can declare both types of exceptions using throws clause i.e. checked and unchecked exceptions. But the method calling the given method must handle only checked exceptions.

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Is exception good or bad?

Exceptions are not bad per se, but if you know they are going to happen a lot, they can be expensive in terms of performance. The rule of thumb is that exceptions should flag exceptional conditions, and that you should not use them for control of program flow.

Is checked exception good?

Checked exceptions are bad because programmers just abuse them by always catching them and dismissing them which leads to problems being hidden and ignored that would otherwise be presented to the user”.

Can we throw runtime exception?

RunTimeException is an unchecked exception. You can throw it, but you don’t necessarily have to, unless you want to explicitly specify to the user of your API that this method can throw an unchecked exception.

Is NPE a checked exception?

It’s not a checked exception (among other things) because it is extremely common. It can occur pretty much everywhere. If it were checked, then nearly every single method in every single Java program anywhere would have to declare that it throws NullPointerException .

Is ClassCastException checked or unchecked?

ClassCastException is one of the unchecked exception in Java. It can occur in our program when we tried to convert an object of one class type into an object of another class type.

Is NullPointerException a runtime exception?

NullPointerException is a runtime exception in Java that occurs when a variable is accessed which is not pointing to any object and refers to nothing or null. Since the NullPointerException is a runtime exception, it doesn’t need to be caught and handled explicitly in application code.

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