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<meta name="description" content="The singleton pattern is one of the simplest design patterns. Sometimes we need to have only one instance of our class .In Java, Singleton class is a class that controls the object creation. It means the singleton class allows us to create a single object of the class, at a time. It is usually used to control access to resources, such as database connections or sockets. It ensures that only one connection is made and a thread can access the connection at a time."/>
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<h3><strong>Java Singleton</strong></h3>
<p><strong>In this tutorial, we will learn about the singleton design pattern and how to apply it in Java with the help of examples.</strong></p>
<p>The singleton pattern is one of the simplest design patterns. Sometimes we need to have only one instance of our class . </p>
<h4><strong>Java Singleton</strong></h4>
<ul>Here's how we can use singletons in Java.
<li>create a <mark>private</mark> constructor that restricts to create an object outside of the class.</li>
<li>create a <mark>private </mark>attribute that refers to the singleton object.</li>
<li>create a <mark>public static </mark>method that allows us to create and access the object we created. Inside the method, we will create a condition that restricts us from creating more than one object.</li>
</ul>
<p><strong> Here's an example.</strong></p>
<code><pre>class SingletonExample {
// private field that refers to the object
private static SingletonExample singleObject;
private SingletonExample() {
// constructor of the SingletonExample class
}
public static SingletonExample getInstance() {
// write code that allows us to create only one object
// access the object as per our need
}
}</pre></code>
<p>In the above example,</p>
<ul>
<li>private static SingletonExample singleObject - a reference to the object of the class.</li>
<li>private SingletonExample() - a private constructor that restricts creating objects outside of the class.</li>
<li>public static SingletonExample getInstance() - this method returns the reference to the only object of the class. Since the method static, it can be accessed using the class name.</li>
</ul>
<center>
<img src="javaphoto/singleton.png" alt="singleton" >
<figcaption><strong>singleton in java</strong></figcaption>
</center>
<h4><strong>Use of Singleton Class</strong></h4>
<p>In Java, Singleton class is a class that controls the object creation. It means the singleton class allows us to create a single object of the class, at a time. It is usually used to control access to resources, such as database connections or sockets. It ensures that only one connection is made and a thread can access the connection at a time.</p>
<h3><strong>Advantages
</strong></h3>
<ul>
<li>Singleton controls concurrent access to the resource.</li>
<li>It ensures there is only one object available across the application in a controlled state.</li>
</ul>
<p><strong>Difference Between Singleton Class and Normal Class</strong></p>
<p>The main difference between these two classes is an instantiation. To create an instance of a normal class, we use a constructor. On the other hand, to create an instance of a singleton class, we use getInstance() method.<br>
Generally, we use the class name as the method name. It avoids confusion.
</p>
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