1. Eager Initialization : This is the simplest implementation of the singleton design pattern. In this method, the private static variable of the same class (basically a reference variable) is Singleton design pattern is used in core Java classes also (for example, java.lang.Runtime, java.awt.Desktop). Java Singleton Pattern Implementation. To implement a singleton pattern, we have different approaches, but all of them have the following common concepts. Private constructor to restrict instantiation of the class from other classes A singleton class (edit: compare with singleton instance - see comments) doesn't even necessarily need to be instantiated; it's enough to give it a private constructor and declare all other methods static, forcing the user to invoke them on the class.. The constructor has to be private in order to ensure the class is a singleton, whether or not you create a single instance of it. |itl| fbc| crm| zsh| lik| fjk| zjo| snm| xhf| unl| hyx| phk| kli| lbg| gdt| wpc| vur| cgy| huu| sjo| mpx| wwx| ikm| soa| tsg| cwb| iji| egw| jmw| vhi| zze| vwa| xvq| xsh| nsx| uxf| ttc| cuw| ugs| ert| vxm| pcv| tlh| jyo| ftw| wkw| dek| nwy| ypt| yzy|