33.6 (Large factorial) Rewrite Exercise 33.1 to handle large factorial. Use the
BigInteger class introduced in Section 10.9.
BigInteger class introduced in Section 10.9.
import java.math.BigInteger; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class Exercise06 { private int number; public int getNumber() { return number; } public void setNumber(int newValue) { number = newValue; } public String getFactorial() { BigInteger factorial = BigInteger.ONE; for (int i = 1; i <= number; i++) { factorial = factorial.multiply(new BigInteger(i + "")); } return factorial.toString(); } }
<?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html"> <h:head> <title>Exercise06</title> </h:head> <h:body> <h3>Compute Factorial Using a Bean</h3> <h:form> <h:outputLabel value="Enter new value: "/> <h:inputText size = "10" value="#{exercise06.number}" /><br /><br /> <h:commandButton value="Compute Factorial"/><br /><br /> Factorial of <h:outputLabel value="#{exercise06.number}"/> is <h:outputLabel value="#{exercise06.factorial}"/> </h:form> </h:body> </html>
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