Error Hierarchy In Exception Details in Java [ 2021 ]

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Error Hierarchy Exception In Details in Java Updated

In this article, we will discuss the exception hierarchy in detail with figure and explanation

The Throwable class is the root class for every exception and it branches out to 2 main categories i.e.;

Throwable is the root class for exception & it’s sub-type and error & it’s sub-types
In other words, it is a superclass for exception & error
java.lang.The throwable class extends java.lang.Object class (as shown in the above figure)
It defines 2 subclasses i.e.; Exception and Error

java.lang.Exception is a superclass for all types of Exception
It extends java.lang.Throwable class
The exception is due to programmatic logic
And it is recoverable
An exception are categorized into a checked and unchecked exception
Example: RuntimeException, SQLException, IOException, FileNotFoundException, ArithmeticException, NullPointerException

java.lang.Error is a superclass for all types of Error
It extends java.lang.Throwable class
Error is due to lack of system resources
And it is non-recoverable
All error falls into unchecked exception category, as it is raised due to lack of system resources at runtime
It is out of programming scope as such type of error can’t predict, maybe well-planned care can be taken to avoid this kind of Error
Example: VirtualMachineError, AssertionError, ExceptionInInitializerError, StackOverflowError, OutOfMemoryError, LinkageError, InstantiationError

Note: the above-mentioned Exception and Error are again categorized into checked and unchecked exceptions

Exception Error Hierarchy In Details in Java Updated