utilities
Class MyMath

java.lang.Object
  |
  +--utilities.MyMath

public class MyMath

extends java.lang.Object

Constructor Summary

MyMath()

Method Summary

static int	factorial(int n)
static void	main(java.lang.String[] args) Test integer MyMath methods.
static int	max(java.lang.Comparable[] a, int n) generic method to find maximum object in a[0:n]
static Computable	sum(Computable[] a, int n) Generic sum method.
static int	sum(int[] a, int n)
static void	swap(int[] a, int i, int j) Swap the integers a[i] and a[j].
static void	swap(java.lang.Object[] a, int i, int j) Generic method to swap the object references a[i] and a[j].

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MyMath

public MyMath()

Method Detail

sum

public static int sum(int[] a,
                      int n)

Returns:

sum of the integers a[0:n-1]

sum

public static Computable sum(Computable[] a,
                             int n)

Generic sum method.

Returns:

null if array has no objects and sum of the objects a[0:n-1] otherwise

swap

public static void swap(int[] a,
                        int i,
                        int j)

Swap the integers a[i] and a[j].

swap

public static void swap(java.lang.Object[] a,
                        int i,
                        int j)

Generic method to swap the object references a[i] and a[j].

factorial

public static int factorial(int n)

Returns:

n!

max

public static int max(java.lang.Comparable[] a,
                      int n)

generic method to find maximum object in a[0:n]

Returns:

position of max element in a[0:n]

Throws:

java.lang.IllegalArgumentException - when n < 0

main

public static void main(java.lang.String[] args)

Test integer MyMath methods. The generic methods are tested by MyInteger.main.