Java™ How To Program (Early Objects), Tenth Edition

18.4 Reimplementing Class FactorialCalculator Using Class BigInteger

Figure 18.4 reimplements class FactorialCalculator using BigInteger variables. To demonstrate larger values than what long variables can store, we calculate the factorials of the numbers 0–50. Line 3 imports class BigInteger from package java.math. The new factorial method (lines 8–15) receives a BigInteger as an argument and returns a BigInteger

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 1   // Fig. 18.4: FactorialCalculator.java 2   // Recursive factorial method. 3   import java.math.BigInteger; 4  5   public class FactorialCalculator 6   { 7      // recursive method factorial (assumes its parameter is >= 0)   8      public static BigInteger factorial(BigInteger number)