singleton-methods

I was playing with singleton class in my IRB. And doing so tried the below snippets. class Foo ; end #=> nil foo = Foo.new #=> #<Foo:0x2022738> foo.define_singleton_method(:bar , method(:puts)) #=> #<Method: Object(Kernel)#puts> Here above I just created a singleton method on instance of class Foo . foo.bar("hi") hi #=> nil foo.singleton_methods #=> [:bar] foo_sing = foo.singleton_class #=> #<Class:#<Foo:0x2022738 foo_sing.is_a? Class #=> true foo_sing.instance_of? Class #=> true foo_sing.inspect #=> "#<Class:#<Foo:0x1e06dc8>>" In the above I tried to create a singleton class on instance of

EDITED Solved :How should i create singleton DBManager class in GoLang. I Referred few code sample of how to create go singleton but i wish to have methods in those and call them on their singleton reference. My Code is as follows package dbprovider import ( "github.com/jinzhu/gorm" _"github.com/jinzhu/gorm/dialects/sqlite" "rest/article" "log" ) type DBOperations interface { AddArticle(article *article.Article) } type DBManager struct { db *gorm.DB isInitialized bool } var dbManagerInstance = new() func GetDBManager() DBManager { return dbManagerInstance } func new() DBManager { localDbRef,

I have a singleton class: public class Singleton { private static Singleton istance = null; private Singleton() {} public synchronized static Singleton getSingleton() { if (istance == null) istance = new Singleton(); return istance; } public void work(){ for(int i=0; i<10000; i++){ Log.d("-----------", ""+i); } } } And multiple Threads are calling the work() function: public class Main { public static void main(String[] args) { new Thread (new Runnable(){ public void run(){ Singleton s = Singleton.getSingleton(); s.work();} }).start(); System.out.println("main thread"); new Thread(new Runnable