public class Arm {
    public static void main(String[] args) throws Exception {
        for (int k = 10; k <= 1000; k++) {
            int n = k;
            int d = 0;
            int s = 0;

            while (n > 0) {
                d = n % 10;
                s = s + (d * d * d);
                n = n / 10;
            }
            if (k == s) {
                System.out.println(k + " is Armstrong number");
            }
        }
    } 
}

OutPut:

153 is Armstrong number
370 is Armstrong number
371 is Armstrong number
407 is Armstrong number

hi, Here I am giving a code which will restrict the object creation upto a fix number of times. And this will throw an exception if the object creation of a class is exceeded a fix number of times.

Here I am giving a sample code for detail visit the following url http://www.roseindia.net/java/limitclassobjectcreation.shtml

ClassInstance.java

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

public final class ClassInstance {

private static ClassInstance ci;
private static int counter=0;

private ClassInstance() {
counter++; 
}
public static ClassInstance getClassInstance() {
if(counter<5)
{
ci = new ClassInstance();
}
else if(counter >=5)
{
ci = new ClassInstance();
ci=null; 
} 
return ci;
}

public static void main(String[] args)
{
try{

List<ClassInstance> list = new ArrayList<ClassInstance>();
ClassInstance obj1 = ClassInstance.getClassInstance();
ClassInstance obj2 = ClassInstance.getClassInstance();
ClassInstance obj3 = ClassInstance.getClassInstance();
ClassInstance obj4 = ClassInstance.getClassInstance();
ClassInstance obj5 = ClassInstance.getClassInstance();
ClassInstance obj6 = ClassInstance.getClassInstance();
ClassInstance obj7 = ClassInstance.getClassInstance();
ClassInstance obj8 = ClassInstance.getClassInstance();
list.add(obj1);
list.add(obj2);
list.add(obj3);
list.add(obj4);
list.add(obj5);
list.add(obj6);
list.add(obj7);
list.add(obj8);
ListIterator<ClassInstance> itr = list.listIterator();
while(itr.hasNext())
{ 
System.out.println(itr.next().hashCode()); 
}
}
catch(Exception e)
{
try
{
if(counter >= 5)
{
MyException.counter = counter;
}
throw new MyException();
}
catch(MyException e1)
{
System.out.println("Exception@ "+ClassInstance.class+" : "+e1);
}
}
}
}