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<!DOCTYPE html>
<html lang="en">
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<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta name="description" content="In Java, the final keyword can be used while declaring an entity. Using the final keyword means that the value can’t be modified in the future. This entity can be - but is not limited to - a variable, a class or a method."/>
<meta name="keywords" content="Java final keyword,final keyword in java,final,about final keyword,How to use final keyword,C, C++, Python, Java, HTML, CSS, JavaScript, SQL, PHP, jQuery, XML, DOM, Bootstrap, Tutorials, Articles, Programming, training, learning, quiz, preferences, examples, code"/>
<title>Java final Keyword | Java Tutorials | CodeMistic</title>
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<h3><strong>Java final keyword</strong></h3>
<p><strong>In this tutorial, we will learn about Java final variables, methods and classes with examples.
</strong></p>
<p>In Java, the final keyword can be used while declaring an entity. Using the final keyword means that the value can’t be modified in the future. This entity can be - but is not limited to - a variable, a class or a method.</p>
<ul> Once any entity (variable, method or class) is declared final, it can be assigned only once. That is,
<li>the final variable cannot be reinitialized with another value
</li>
<li>the final method cannot be overridden
</li>
<li>the final class cannot be extended
</li>
</ul>
<h4><strong>1. Java final Variable</strong></h4>
<p>In Java, we cannot change the value of a final variable. If a variable is declared with the final keyword, its value cannot be changed once initialized. Note that the variable does not necessarily have to be initialized at the time of declaration. If it’s declared but not yet initialized, it’s called a <strong>blank final variable</strong>.</p>
<p><strong>Example :
</strong></p>
<pre><code> class Bike{
final int speedlimit=90;//final variable
void run(){
speedlimit=400;
}
public static void main(String args[]){
Bike obj=new Bike();
obj.run();
}
}//end of class
<strong>OUTPUT:</strong>
Compile Time Error
</code></pre>
<h4><strong> 2. Java final method
</strong></h4>
<p>When a method is declared with final keyword, it is called a final method. A final method cannot be overridden. The Object class does this—a number of its methods are final.We must declare methods with final keyword for which we required to follow the same implementation throughout all the derived classes. <br>The following fragment illustrates final keyword with a method:</p>
<code><pre>class A
{
final void m1()
{
System.out.println("This is a final method.");
}
}
class B extends A
{
void m1()
{
// COMPILE-ERROR! Can't override.
System.out.println("Illegal!");
}
}
</pre></code>
<p><strong>Example :
</strong></p>
<pre><code>class Bike{
final void run(){System.out.println("running");}
}
class Honda extends Bike{
void run(){System.out.println("running safely with 100kmph");}
public static void main(String args[]){
Honda honda= new Honda();
honda.run();
}
}
<strong>OUTPUT:</strong>
Compile Time Error
</code></pre>
<h4><strong> 3. Java final classes
</strong></h4>
<p>When a class is declared with final keyword, it is called a final class. A final class cannot be extended(inherited). There are two uses of a final class :</p>
<ol>
<li>One is definitely to prevent inheritance, as final classes cannot be extended. For example, all Wrapper Classes like Integer,Float etc. are final classes. We can not extend them.</li>
<code><pre>final class A
{
// methods and fields
}
// The following class is illegal.
class B extends A
{
// COMPILE-ERROR! Can't subclass A
}
</pre></code>
<li>The other use of final with classes is to create an immutable class like the predefined String class.You can not make a class immutable without making it final.</li>
</ol>
<p><strong>Example :
</strong></p>
<pre><code>final class Bike{}
class Honda1 extends Bike{
void run(){System.out.println("running safely with 100kmph");}
public static void main(String args[]){
Honda1 honda= new Honda1();
honda.run();
}
}
<strong>OUTPUT:</strong>
Compile Time Error
</code></pre>
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