write a program to create singleton class?

Check this singleton design pattern explained with programs and steps

public class Singleton {

static Singleton obj;
private  Singleton(){
}

public static Singleton getInstance(){
if(obj!=null){
return  obj;
}
else{
obj=new Singleton();
return obj;
}
}

public static void main(String[] args) {

Singleton obj=Singleton.getInstance();
Singleton obj1=Singleton.getInstance();

if(obj==obj1){
System.out.println("indhu");
}
else{
System.out.println("Sindhu");
}
               System.out.println(obj==obj1);

}
}

Output:

indhu

true

Check this singleton design pattern explained with programs and steps