Touring Additional Utility APIs - Beginning Java 7 - page 546

{

public BigDecimal call()
{

MathContext mc = new MathCon-

text(100,

Round-

ingMode.HALF_UP);

BigDecimal result = BigDecim-

al.ZERO;

for (int i = 0; i <= LASTITER;

i++)

{

BigDecimal factorial = factori-

al(new BigDecimal(i));

BigDecimal res = BigDecim-

al.ONE.divide(factorial, mc);
result = result.add(res);

}
return result;

}
public BigDecimal factorial(BigDecimal

n)

{

if (n.equals(BigDecimal.ZERO))
return BigDecimal.ONE;
else
return
n.multiply(factorial(n.subtract(BigDecimal.ONE)));
}

};
Future<BigDecimal> taskFuture = execut-

or.submit(callable);
try
{

while (!taskFuture.isDone())
System.out.println("waiting");