JAVA SINGLETON PATTERN

Java Singleton Pattern

To implement a Singleton pattern,

• This overcome the problem of private constructor , that is other class main method cant create object to present class with private constructor.
• This technique is used to create and use class reference of present class, having private constructor , or access content in private constructor using static method present in class having private constructor;
• this is a sample program to illustrate the singleton pattern;

class santha      // 1st class 
{
public static santha yes=null;  // here santha is class name type
String gift;
    private santha()  // this is private constructor
    {
     gift="bike";
       
    }
    
   public static santha ask_minions() // this is reference (yes) of class santha and this only of type null only or if change type 
    {
      if(yes==null)
      {
          yes=new santha(); 
      }
      return yes;
    }
}

public class SAMPLE1       // 2nd class 
{    
 public static void main(String []args)
 {
    santha amith=santha.ask_minions();  //here amith is reference of type class santha // here static method ask_minions() is called using syntax class_name.static_methos_name();

     System.out.println(amith.gift);
 }
}