Top 11 interview questions on Exceptions handling in Java for SDET/Developers/Automation Testing?Exception handling in Java

This post is completely on theory, but I will post another one with example for each exception mentioned below:

• Arithmetic Exception: 

It is thrown when an exceptional condition has occurred in an arithmetic operation.

• ArrayIndexOutOfBoundException: 

 It is thrown to indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array.

• ClassNotFoundException:

 This Exception is triggered when we try to access a class whose definition is not found.

• FileNotFoundException:

This Exception is thrown when a file is not accessible or does not open. Quite common

• InterruptedException: 

 It is triggered when a thread is waiting , sleeping , or doing some processing , and it is interrupted.

• NoSuchMethodException: 

It is thrown when accessing a method which is not found.

• NullPointerException: 

 This exception is appeared when referring to the members of a null object.

• NumberFormatException:

 This exception is thrown when a method could not convert a string into a numeric format.

• StringIndexOutOfBoundsException:

It is thrown by String class methods to indicate that an index is either negative than the size of the string.

• What is checked and unchecked exception?

1) Checked Exception:

The classes which directly inherit Throwable class except the RuntimeException and Error are called as checked exceptions e.g. IOException, SQLException etc. Those exceptions are checked at compile-time.

2) Unchecked Exception:

The classes which inherit RuntimeException are known as unchecked exceptions e.g. ArithmeticException, ArrayIndexOutOfBoundsException ,NullPointerException etc. 
Unchecked exceptions are not checked at compile-time, but they are checked at runtime.

• What is Error?

Error is not recoverable e.g. OutOfMemoryError, VirtualMachineError, AssertionError etc.

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