Java Tutorial
- Java - Home
- Java - Overview
- Java - History
- Java - Features
- Java vs C++
- Java Virtual Machine(JVM)
- Java - JDK vs JRE vs JVM
- Java - Hello World Program
- Java - Environment Setup
- Java - Basic Syntax
- Java - Variable Types
- Java - Data Types
- Java - Type Casting
- Java - Unicode System
- Java - Basic Operators
- Java - Comments
- Java - User Input
Java Control Statements
- Java - Loop Control
- Java - Decision Making
- Java - If-else
- Java - Switch
- Java - For Loops
- Java - For-Each Loops
- Java - While Loops
- Java - do-while Loops
- Java - Break
- Java - Continue
Object Oriented Programming
- Java - OOPs Concepts
- Java - Object & Classes
- Java - Class Attributes
- Java - Class Methods
- Java - Methods
- Java - Variables Scope
- Java - Constructors
- Java - Access Modifiers
- Java - Inheritance
- Java - Aggregation
- Java - Polymorphism
- Java - Overriding
- Java - Method Overloading
- Java - Dynamic Binding
- Java - Static Binding
- Java - Instance Initializer Block
- Java - Abstraction
- Java - Encapsulation
- Java - Interfaces
- Java - Packages
- Java - Inner Classes
- Java - Static Class
- Java - Anonymous Class
- Java - Singleton Class
- Java - Wrapper Classes
- Java - Enums
- Java - Enum Constructor
- Java - Enum Strings
Java Built-in Classes
- Java - Number
- Java - Boolean
- Java - Characters
- Java - Strings
- Java - Arrays
- Java - Date & Time
- Java - Math Class
Java File Handling
- Java - Files
- Java - Create a File
- Java - Write to File
- Java - Read Files
- Java - Delete Files
- Java - Directories
- Java - I/O Streams
Java Error & Exceptions
- Java - Exceptions
- Java - try-catch Block
- Java - try-with-resources
- Java - Multi-catch Block
- Java - Nested try Block
- Java - Finally Block
- Java - throw Exception
- Java - Exception Propagation
- Java - Built-in Exceptions
- Java - Custom Exception
Java Multithreading
- Java - Multithreading
- Java - Thread Life Cycle
- Java - Creating a Thread
- Java - Starting a Thread
- Java - Joining Threads
- Java - Naming Thread
- Java - Thread Scheduler
- Java - Thread Pools
- Java - Main Thread
- Java - Thread Priority
- Java - Daemon Threads
- Java - Thread Group
- Java - Shutdown Hook
Java Synchronization
- Java - Synchronization
- Java - Block Synchronization
- Java - Static Synchronization
- Java - Inter-thread Communication
- Java - Thread Deadlock
- Java - Interrupting a Thread
- Java - Thread Control
- Java - Reentrant Monitor
Java Networking
- Java - Networking
- Java - Socket Programming
- Java - URL Processing
- Java - URL Class
- Java - URLConnection Class
- Java - HttpURLConnection Class
- Java - Socket Class
- Java - Generics
Java Collections
Java List Interface
Java Queue Interface
Java Map Interface
- Java - Map Interface
- Java - HashMap
- Java - LinkedHashMap
- Java - WeakHashMap
- Java - EnumMap
- Java - SortedMap Interface
- Java - TreeMap
- Java - The IdentityHashMap Class
Java Set Interface
- Java - Set Interface
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - SortedSet Interface
- Java - TreeSet
Java Data Structures
- Java - Data Structures
- Java - Enumeration
- Java - BitSet Class
- Java - Dictionary
- Java - Hashtable
- Java - Properties
Java Collections Algorithms
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
- Java - Record Classes
- Java - Hidden Classes
- Java - Compact Number Formatting
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Array Methods
- Java - Streams
- Java - Datetime Api
- Java 8 - New Features
- Java 9 - New Features
Java APIs & Frameworks
Java Useful Resources
Java - finally Keyword
Java finally keyword is used to define a finally block in a Java program. The finally block in Java follows a try block or a catch block. A finally block of code always executes, irrespective of occurrence of an Exception in a Java program.
Using a Java finally block allows you to run any cleanup-type statements that you want to execute, no matter what happens in the protected code.
A finally block appears at the end of the catch blocks in Java program and has the following syntax −
Syntax
try { // Protected code } catch (ExceptionType1 e1) { // Catch block } catch (ExceptionType2 e2) { // Catch block } catch (ExceptionType3 e3) { // Catch block }finally { // The finally block always executes. }
Example
In this example, we're accessing an element of an array using invalid index. When program runs, it throws ArrayIndexOutOfBoundsException. As we're handling this exception in catch block, the following finally block is also executed.
// File Name : ExcepTest.java package com.tutorialspoint; public class ExcepTest { public static void main(String args[]) { int a[] = new int[2]; try { System.out.println("Access element three :" + a[3]); } catch (ArrayIndexOutOfBoundsException e) { System.out.println("Exception thrown :" + e); }finally { a[0] = 6; System.out.println("First element value: " + a[0]); System.out.println("The finally statement is executed"); } } }
Output
Exception thrown :java.lang.ArrayIndexOutOfBoundsException: 3 First element value: 6 The finally statement is executed
Example
In this example, we're accessing an element of an array using invalid index. When program runs, it throws ArrayIndexOutOfBoundsException. As we're handling this exception in catch block, and throwing an exception further then following finally block will still be executed.
// File Name : ExcepTest.java package com.tutorialspoint; public class ExcepTest { public static void main(String args[]) throws CustomException { int a[] = new int[2]; try { System.out.println("Access element three :" + a[3]); } catch (ArrayIndexOutOfBoundsException e) { System.out.println("Exception thrown :" + e); throw new CustomException(e); }finally { a[0] = 6; System.out.println("First element value: " + a[0]); System.out.println("The finally statement is executed"); } } } class CustomException extends Exception{ private static final long serialVersionUID = 1L; CustomException(Exception e){ super(e); } }
Output
Exception thrown :java.lang.ArrayIndexOutOfBoundsException: 3 Exception in thread "main" First element value: 6 The finally statement is executed com.tutorialspoint.CustomException: java.lang.ArrayIndexOutOfBoundsException: 3 at com.tutorialspoint.ExcepTest.main(ExcepTest.java:12) Caused by: java.lang.ArrayIndexOutOfBoundsException: 3 at com.tutorialspoint.ExcepTest.main(ExcepTest.java:9)
Note the following −
A catch clause cannot exist without a try statement.
It is not compulsory to have finally clauses whenever a try/catch block is present.
The try block cannot be present without either catch clause or finally clause.
Any code cannot be present in between the try, catch, finally blocks.
To Continue Learning Please Login
Login with Google