Java / Design Patterns
How to implement a singleton pattern?
Create a public class having a private constructor. Private constructor ensures that the object cannot be created outside of the class.
Create a private static variable of the type Class itself.
Create a public static method e.g. getInstance() that returns the reference of the static variable, if the static variable is null then create a object for the class.
package org.javatutorials.designpatterns; //Step 1 public class SingletonPattern { //Step 2 private static SingletonPattern mySingletonObj; private SingletonPattern() { } public static SingletonPattern getInstance() { if (mySingletonObj == null) { mySingletonObj = new SingletonPattern(); } return mySingletonObj; } }
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