Hi,
Try This.

public class SumOfSeries {

/**
* @param 'begin' holds the start of the series
* @param 'end' holds the end of the series
* @param 'series' holds the series need to be printed
*/
StringBuffer series=new StringBuffer();
public static void main(String[] args) {
int begin = 0;
int end = 5;
SumOfSeries obj = new SumOfSeries();
int result = obj.Sum(begin, end);
obj.MoidfySeries();
System.out.println("Sum of the series from "+begin+" to "+end+" : "+obj.series+result);
}

public int factorial(int num){
int temp=1;
if(num==0)
return 1;
for(int i=num;i>0;i--)
{
temp = temp*i;
}
return temp;
}

public int Sum(int start, int end){
int sumOfSeries=0;
int fact=0;
int sum = 0;
for(int i=start;i<=end;i++){
fact = factorial(i);
sum = fact+i;
series = series.append(sum).append('+');
sumOfSeries = sumOfSeries + sum;
}
return sumOfSeries ;
}

/**
* This method modifies the series that need to be printed
* by replacing the last character of the String Buffer '+' to '='
*/

public void MoidfySeries(){
int index = series.lastIndexOf("+");
series.setCharAt(index, '=');
}
}

Regards,
javaquest2010