Class LP1

java.lang.Object

LP1

public class LP1
extends Object

Constructor Summary

Constructors

Constructor	Description
LP1()

Method Summary

Modifier and Type	Method	Description
static HashMap<Character,Integer>	alphaCharCount(String s)	This produces a hash map containing as keys the letters a-z and values that show the number of times each character appears in the string, case insensitive.
static int	arraySum(int[] arr)	Computes the sum of an integer array
static ArrayList<String>	between(ArrayList<String> a, char low, char high)	This function returns a new array list with all elements from the array list a begin with all letters between characters low and high, inclusive and case-insensitive.
static boolean	isAPowerOf2(BigInteger b)	This functon tests if the BigInteger passed it is a power of 2.
static void	main(String[] args)
static int	sumOfDigits(int n, int base)
static String	vowelExtractor(String s)	This function pulls all vowels, in from a string and returns them bundled in a string

Methods inherited from class java.lang.Object

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

Constructor Details

LP1

public LP1()

Method Details

main

public static void main(String[] args)

arraySum

public static int arraySum(int[] arr)

Computes the sum of an integer array

Parameters:

arr - an array of integers

Returns:

the sum of the entries in arr

vowelExtractor

public static String vowelExtractor(String s)

This function pulls all vowels, in from a string and returns them bundled in a string

Parameters:

s - the string you are extracting from

Returns:

a string containing all vowels (aeiou) from s in their original case.

isAPowerOf2

public static boolean isAPowerOf2(BigInteger b)

This functon tests if the BigInteger passed it is a power of 2.

Parameters:

b - is a BigInteger

Returns:

true if b is a power of 2 and false otherwise.

between

public static ArrayList<String> between(ArrayList<String> a,
 char low,
 char high)

This function returns a new array list with all elements from the array list a begin with all letters between characters low and high, inclusive and case-insensitive.

Parameters:

a - an array list of nonempty strings

low - a letter character

high - a letter character

Returns:

a new array list containing all entries of a whose first letter is between low and high, inclusive. If low > high, switch them. NOTE: characters are primitives, use <, >, <= , >=, !=, and == to * compare them!

sumOfDigits

public static int sumOfDigits(int n,
 int base)

Parameters:

n - is a nonnegative integer

base - is a base ( between 2 and 36 inclusive)

Returns:

the total of the digits in a base b expansion of n

alphaCharCount

public static HashMap<Character,Integer> alphaCharCount(String s)

This produces a hash map containing as keys the letters a-z and values that show the number of times each character appears in the string, case insensitive.

Parameters:

s - a string

Returns:

a "dictionary" in a HashMap containing as keys the letters a-z and as values the number of times each character occurs in the string, case insensitive.