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The Singleton pattern is a design pattern that restricts the instantiation of a class to a single instance. This is useful when exactly one object is needed to coordinate actions across the system. The code provided is a Java implementation of this pattern.
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The Singleton pattern is implemented by creating a class with a method that creates a new instance of the class if one does not exist. If an instance already exists, it simply returns a reference to that object. To ensure that an object cannot be instantiated in any other way, the constructor is made private. In this code, the 'JavaSingletonPattern' class has a private constructor and a static method 'getSingleInstance' that returns the single instance of the class.
/**
*
*/
package com.javaaid.hackerrank.solutions.languages.java.advanced;
/**
*
*/
public class JavaSingletonPattern {
public String str = "";
private static final JavaSingletonPattern instance=null;
private JavaSingletonPattern() {
}
public static JavaSingletonPattern getSingleInstance() {
if (instance == null)
return new JavaSingletonPattern();
return instance;
}
}
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