Skip to main content

Limit the number of objects being created in JAVA

Q   :- Limit the number of objects being created in JAVA.

Sol :- The example below limits creation of objects of MyClass class to a maximum of 5 by declaring the constructor private and calling it via getMyClass() method.If an attempt to create more than 5 objects is done, the getMyClass() method will return a null,thus,the object so created will not be referenced and ultimately cleared by the garbage collector.
 
import java.io.*;
class MyClass
{
public static int count=0;
int a;
private MyClass()
{
count++;
a=count;
System.out.println("object created  = "+a);
if(count>4)
System.out.println("Object Creation Limit Exceeded");
}
public static MyClass getMyClass()
{
if(MyClass.count==5)
return null;
else
return new MyClass();
}
}

class LimitObjectInstance
{
public static void main(String [] args)
{
int i=-1,ch;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); 
MyClass obj[]=new MyClass[10];
while(true)
{
System.out.println("\nDo you want to create new Object (1 for Yes ) ??   ");
try
{
ch=Integer.parseInt(br.readLine()) ;
}
catch(Exception e)
{
ch=2;
}
if(ch==1)
{
i++;
                   obj[i]= MyClass.getMyClass();
}
else
{
System.exit(0);
}
}
}
}

Comments

Popular posts from this blog

AGRICULTURAL SCIENTIST RECRUITMENT BOARD

Agricultural Research Service

National
Eligibility Test/ Senior Research Fellowship Examination 

The Agricultural Scientists Recruitment Board (ASRB)
 holds a Competitive Examination for recruiting Scientists of the ARS in the pay scale of Rs. 8,000-13,500 in the ICAR Institutes, combined with National Eligibility Test (NET) for recruitment of Lecturers and Assistant Professors by the State Agricultural Universities (SAUS) and for award of ICAR Senior Research Fellowships.

The selected candidates for Agricultural Research Service must serve in the institutes to which they are posted until they find appointment for higher positions through selection at other institutes.

(i) Candidates successful in ARS are appointed as Scientists in the Indian Council of Agricultural Research in the pay scale of Rs. 8,000-13,500.

(ii) Candidates clearing the National Eligibility Test are recommended to various State Agricultural Universities who will consider them for appointment as Lecturers or Assistant Pro…

CIVIL SERVICES' (I.A.S.) EXAMINATION

The Union Public Service Commission (U.P.S.C.) conducts Civil Services' Examination once a year in two stages. The Preliminary Examination (Objective Type) for selection of candidates for the Main Examination is held in the month of May.

The Civil Services Main Examination
 is held in the months of October/November. Blank application forms and other particulars are published in the Employment News, generally in the month of December.

The last date for the submission of applications to the Secretary, Union Public Service Commission, Dholpur House, Shahjahan Road, NewDelhi-11001 1 is usually the last week of January of the year of examination.

The Combined Civil Services Examination is conducted for Recruitment to the following Services/Posts:

1. Indian Administrative Service.
2. Indian Foreign Service.
3. Indian Police Service.
4. Indian P & T Accounts & Finance Service, Group 'A'.
5. Indian Audit and Accounts Service, Group 'A'.
6. Indian Customs and Central Excise S…

HSC Exam Time Table 2013 Arts, Commerce, Science

HSC Exam Time Table 2013:- Date: 21 Feb 2013 (Thursday)

Paper: (Marathi / Gujarati / Kannada / Sindi / Malyalam / Tamil / Telugu / Punjabi / Bengali
Time: 11.00 am to 2.00 pm

Date: 22 Feb 2013 (Friday)

Paper: Hindi
Time: 11.00 am to 2.00 pm
Paper: German / Andhramagadhi / Persian
Time: 3.00 am to 6.00 pm

Date: 23 Feb 2013 (Saturday)

Paper: English
Time: 11.00 am to 2.00 pm

Date: 25 Feb 2013 (Monday)

Paper: Secretarial Practice
Time: 11.00 am to 2.00 pm
Paper: Physics
Time: 11.00 am to 2.00 pm
Paper: Political Science
Time: 3.00 am to 6.00 pm

Date: 27 Feb 2013 (Wednesday)

Paper: Book Keeping & Accoutancy
Time: 11.00 am to 2.00 pm
Paper: Chemistry (will Be held on 26 March)
Time: 11.00 am to 2.00 pm
Paper: Philosophy
Time: 3.00 am to 6.00 pm

Date: 1 March 2013 (Friday)

Paper: Mathematics & Statistics Paper (Revised)
Time: 11.00 am to 2.00 pm
Paper: Mathematics & Statistics - I (Commerce)
Time: 11.00 am to 1.00 pm
Paper: Sociology
Time: 3.00 am to 6.00 pm

Date: 2 March 2013 (Saturd…