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Private Constructor

Posted By: Josephine Gomez     Category: Java     Views: 9589

This article explains about private constructor in java with example.

Private constructors prevent a class from being explicitly instantiated by callers. private constructor are used to create Sinleton class. It can be invoked by code in the same class.

Syntax of Private Constructor

class clsName
{
     // Variable declaration
 
     private clsName()
     {
     }

     // Methods
}


clsName is a valid identifier in java. It is a class name.

Example of Private Constructor

Example 1 : Program that illustrates private constructor use in java 

public class SingletonObject
{
    private SingletonObject()
    {
        // no code
    }

    public static SingletonObject getObject()
    {
      // we can call this constructor
      if (ref == null) 
          ref = new SingletonObject();
      return ref;
    }

    private static SingletonObject ref;
}

public class PrivateVariableDemo
{
  public static void main(String args[])
  {
  SingletonObject sObj = SingletonObject.getSingletonObject();
  }
}
  
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Josephine Gomez
Josephine Gomez author of Private Constructor is from Wichita, United States.
 
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