Bhavin Mehta

• Sep 27th, 2005

 

i dont think it is directly possible thru any methods. u can use a static avriable to achive this. go thru following code:

public class test1
{
 static int cntr=0;
 test1()
 { cntr++;
  if(cntr>2)
   throw new NullPointerException();//u can define a new exception  // for this
 }

 public static void main(String args[])
 {
  test1 t1= new test1();
  System.out.println("hello 1");
  test1 t2= new test1();
  System.out.println("hello 2");
  test1 t3= new test1();
 }
}

bhavinpmehta

 Profile Answers by bhavinpmehta 

• Sep 27th, 2005

 

naveen.jayaram

 Profile Answers by naveen.jayaram 

• Sep 30th, 2005

 

by keepineg count of number of objects

for example

public class ThreeObject{    private ThreeObject()    {        // no code req'd    }    public static ThreeObject getThreeObject()    {

      int count;      if (ref == null)       count = 0;   

            if (count <2)

{	ref = new SingletonObject();      

return ref;

count ++ ;

}    }    private static SingletonObject ref;}

vinaymudgil007

 Profile Answers by vinaymudgil007 

• Jun 3rd, 2008

 

Here is a code snippet that will create maximum of two objects.

*******************************************************************
//This is a class that will create maximum of two objects for itself.

class stPlusOne
{
    private static int counter = 1;
   
    //Private constructor to ensure that no-one other than this class itself can create the object.
    private stPlusOne()
    {
        System.out.println(" inside constructor counter -->"+counter);
    }
   
    //Class level method that creates object and return's the reference to it.
    public static stPlusOne createObject()
    {
        stPlusOne obj;
        if(counter<3) //if condition to ensure not more than two objects are created
        {
            counter ++;
            obj = new stPlusOne();
        }
        else
        {
            System.out.println("Can't create more than two objects......");
            obj = null;
        }
       
        return obj;
    }

    //main method
    public static void main(String[] args)
    {
        System.out.println("Hello World!");
        stPlusOne obj1 = stPlusOne.createObject();
        stPlusOne obj2 = stPlusOne.createObject();
        stPlusOne obj3 = stPlusOne.createObject();
        stPlusOne obj4 = stPlusOne.createObject();

        if(obj1 != null)
            System.out.println("obj1.hashCode() --->"+obj1.hashCode());

        if(obj2 != null)
            System.out.println("obj2.hashCode() --->"+obj2.hashCode());
       
        if(obj3 != null)
            System.out.println("obj3.hashCode() --->"+obj3.hashCode());
       
        if(obj4 != null)
            System.out.println("obj4.hashCode() --->"+obj4.hashCode());
    }
}

*******************************************************************