Runtime exception usually occurs because of bad programming or programming error. Unchecked Exception or RunTimeException:Ī Runtime Exception or Uncheck Exception is a subclass of class. When we look at the constructor of FileInputStream, public FileInputStream(String name) throws FileNotFoundException 2. The above code throws a compile-time exception “FileNotFoundException”, as there can be a possibility of file not present at the mentioned location. package com.javainterviewpoint įileInputStream fileInputStream = new FileInputStream('test.txt')

Throw the exception using throws keyword in the method signatureĪ checked exception occurs whenever we are doing some operation that is not in the control of the JVM.įor example, Let’s try to open a file.

A try-catch block to handle the exception.

Checked Exception or Compile Time Exception:Ī Checked Exception or Compile-Time Exception is a subclass of the but not a subclass of .Ĭhecked Exception is the exception that will be checked during the compile-time, if a method throws a checked exception then the calling method must have one of the below Whereas Runtime Exception happens due to bad programming such as not handling null properly, dividing a number by zero, etc.

On the other hand, the Exceptions branch further splits into two IOException and Runtime exceptions.Įxcept for the Error and RuntimeException and its subclasses, all other classes will be a part of Checked Exception (Compile-time exception).Ĭhecked Exception happens on the occurrence of events which is beyond the control of the JVM like File not present or reading from the database where there might be a situation that the database is down etc.

Unchecked exceptions (Runtime exceptions)Īll the exceptions descend from the Throwable class, and then the hierarchy splits into two branches Error and Exception.Įrror hierarchy describes the internal error or any resource exhaustion or any other malfunction which happens in the JVM.

Checked exceptions (Compile-time exceptions).

Types of Exceptions in JavaĮxceptions can be divided into three main categories It is always better to know which exception occurs in which situation so that we will have better control in handling the exception. Exceptions can happen in any scenario, and all developers would have come across exceptions, for example, whenever we try to read a file that doesn’t exist or whenever we try to read the elements in an array beyond its size and so on.

Exception error java