de.alpharogroup.math

Class MathExtensions

java.lang.Object

de.alpharogroup.math.MathExtensions

public final class MathExtensions
extends java.lang.Object

Utility class for the use numbers.

Method Summary

Modifier and Type	Method and Description
static int	getNumberOfDigits(int number) Gets the number of digits from the given int number.
static int[]	getPrimeNumbers(int quantity) Gets the prime numbers for the given quantity.
static boolean	isBetween(double min, double max, double index) Checks the given double index is between the range from min and max.
static boolean	isBetween(double min, double max, double index, boolean includeMin, boolean includeMax) Checks the given double index is between the range from min and max.
static boolean	isBetween(float min, float max, float index) Checks the given float index is between the range from min and max.
static boolean	isBetween(float min, float max, float index, boolean includeMin, boolean includeMax) Checks the given float index is between the range from min and max.
static boolean	isBetween(int min, int max, int index) Checks the given int index is between the range from min and max.
static boolean	isBetween(int min, int max, int index, boolean includeMin, boolean includeMax) Checks the given int index is between the range from min and max.
static boolean	isBetween(long min, long max, long index) Checks the given long index is between the range from min and max.
static boolean	isBetween(long min, long max, long index, boolean includeMin, boolean includeMax) Checks the given long index is between the range from min and max.
static boolean	isInRange(int min, int max, int number) Checks the given number is in range from min and max.
static boolean	isNegative(double number) Checks if the number is negative.
static boolean	isNegative(float number) Checks if the number is negative.
static boolean	isNegative(int number) Checks if the number is negative.
static boolean	isNegative(long number) Checks if the number is negative.
static boolean	isNext(java.lang.Integer number, java.lang.Integer nextNumber) Checks if the given Integer nextNumber is next to the given Integer number.
static boolean	isPositive(double number) Checks if the number is positive.
static boolean	isPositive(float number) Checks if the number is positive.
static boolean	isPositive(int number) Checks if the number is positive.
static boolean	isPositive(long number) Checks if the number is positive.
static boolean	isPrevious(java.lang.Integer number, java.lang.Integer previousNumber) Checks if the given Integer previousNumber is previous to the given Integer number.
static boolean	isPrime(double n) Checks if the given float is a prime number.
static boolean	isPrime(float n) Checks if the given float is a prime number.
static boolean	isPrime(int n) Checks if the given int is a prime number.
static boolean	isPrime(long n) Checks if the given long is a prime number.
static boolean	isPrimeNumber(int number) Checks if the number is a prime number.
static double	percentageOf(double value, double percentage) Calculates the percentage of the given value
static double	percentageOf(float value, float percentage) Calculates the percentage of the given value
static double	percentageOf(int value, int percentage) Calculates the percentage of the given value
static double	percentageOf(long value, long percentage) Calculates the percentage of the given value
static int[]	printAllPrimeNumbersTill(int noOfPrimes) Prints all prime numbers till the given number.
static double	ruleOfThreeProportional(double a, double b, double c) Calculates the formula from rule of three in a proportional manner Example: if 2 souflaki costs 8 dollar how much costs 5 souflaki so a is 2 souflaki and b is 8 dollar and c is 5 souflaki return x which is 20 dollar

Methods inherited from class java.lang.Object

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

Method Detail

getNumberOfDigits

public static int getNumberOfDigits(int number)

Gets the number of digits from the given int number.

Parameters:

number - the number

Returns:

the number of digits

getPrimeNumbers

public static int[] getPrimeNumbers(int quantity)

Gets the prime numbers for the given quantity.

Parameters:

quantity - The quantity.

Returns:

An array from prime numbers.

isBetween

public static boolean isBetween(double min,
                                double max,
                                double index)

Checks the given double index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

Returns:

Returns true if the index is betwenn the range from min and max otherwise false.

isBetween

public static boolean isBetween(double min,
                                double max,
                                double index,
                                boolean includeMin,
                                boolean includeMax)

Checks the given double index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

includeMin - if true than min value is included

includeMax - if true than max value is included

Returns:

Returns true if the index is between the range from min and max considered the given flags otherwise false.

isBetween

public static boolean isBetween(float min,
                                float max,
                                float index)

Checks the given float index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

Returns:

Returns true if the index is betwenn the range from min and max otherwise false.

isBetween

public static boolean isBetween(float min,
                                float max,
                                float index,
                                boolean includeMin,
                                boolean includeMax)

Checks the given float index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

includeMin - if true than min value is included

includeMax - if true than max value is included

Returns:

Returns true if the index is between the range from min and max considered the given flags otherwise false.

isBetween

public static boolean isBetween(int min,
                                int max,
                                int index)

Checks the given int index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

Returns:

Returns true if the index is betwenn the range from min and max otherwise false.

isBetween

public static boolean isBetween(int min,
                                int max,
                                int index,
                                boolean includeMin,
                                boolean includeMax)

Checks the given int index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

includeMin - if true than min value is included

includeMax - if true than max value is included

Returns:

Returns true if the index is between the range from min and max considered the given flags otherwise false.

isBetween

public static boolean isBetween(long min,
                                long max,
                                long index)

Checks the given long index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

Returns:

Returns true if the index is betwenn the range from min and max otherwise false.

isBetween

public static boolean isBetween(long min,
                                long max,
                                long index,
                                boolean includeMin,
                                boolean includeMax)

Checks the given long index is between the range from min and max.

Parameters:

min - The minimum.

max - The maximum.

index - The index.

includeMin - if true than min value is included

includeMax - if true than max value is included

Returns:

Returns true if the index is between the range from min and max considered the given flags otherwise false.

isInRange

public static boolean isInRange(int min,
                                int max,
                                int number)

Checks the given number is in range from min and max.

Parameters:

min - The minimum.

max - The maximum.

number - The index.

Returns:

Returns true if the number is in range from min and max otherwise false.

isNegative

public static boolean isNegative(double number)

Checks if the number is negative.

Parameters:

number - The number.

Returns:

Returns true if the number is negative otherwise false.

isNegative

public static boolean isNegative(float number)

Checks if the number is negative.

Parameters:

number - The number.

Returns:

Returns true if the number is negative otherwise false.

isNegative

public static boolean isNegative(int number)

Checks if the number is negative.

Parameters:

number - The number.

Returns:

Returns true if the number is negative otherwise false.

isNegative

public static boolean isNegative(long number)

Checks if the number is negative.

Parameters:

number - The number.

Returns:

Returns true if the number is negative otherwise false.

isNext

public static boolean isNext(java.lang.Integer number,
                             java.lang.Integer nextNumber)

Checks if the given Integer nextNumber is next to the given Integer number.
Example:
isNext(1, 2); => true;
isNext(1, 3); => false;
isNext(4, 3); => false;

Parameters:

number - the number

nextNumber - the next number

Returns:

true, if the given Integer nextNumber is next to the given Integer number otherwise false.

isPositive

public static boolean isPositive(double number)

Checks if the number is positive.

Parameters:

number - The number.

Returns:

Returns true if the number is positive otherwise false.

isPositive

public static boolean isPositive(float number)

Checks if the number is positive.

Parameters:

number - The number.

Returns:

Returns true if the number is positive otherwise false.

isPositive

public static boolean isPositive(int number)

Checks if the number is positive.

Parameters:

number - The number.

Returns:

Returns true if the number is positive otherwise false.

isPositive

public static boolean isPositive(long number)

Checks if the number is positive.

Parameters:

number - The number.

Returns:

Returns true if the number is positive otherwise false.

isPrevious

public static boolean isPrevious(java.lang.Integer number,
                                 java.lang.Integer previousNumber)

Checks if the given Integer previousNumber is previous to the given Integer number.
Example:
isPrevious(1, 2); => false;
isPrevious(1, 3); => false;
isPrevious(4, 3); => true;

Parameters:

number - the number

previousNumber - the previous number

Returns:

true, if the given Integer previousNumber is previous to the given Integer number otherwise false.

isPrime

public static boolean isPrime(double n)

Checks if the given float is a prime number.

Parameters:

n - The int to check.

Returns:

Returns true if the float is a prime number otherwise false.

isPrime

public static boolean isPrime(float n)

Checks if the given float is a prime number.

Parameters:

n - The int to check.

Returns:

Returns true if the float is a prime number otherwise false.

isPrime

public static boolean isPrime(int n)

Checks if the given int is a prime number.

Parameters:

n - The int to check.

Returns:

Returns true if the int is a prime number otherwise false.

isPrime

public static boolean isPrime(long n)

Checks if the given long is a prime number.

Parameters:

n - The int to check.

Returns:

Returns true if the long is a prime number otherwise false.

isPrimeNumber

public static boolean isPrimeNumber(int number)

Checks if the number is a prime number.

Parameters:

number - The number.

Returns:

Returns true if the number is a prime number otherwise false.

printAllPrimeNumbersTill

public static int[] printAllPrimeNumbersTill(int noOfPrimes)

Prints all prime numbers till the given number.

Parameters:

noOfPrimes - The limit.

Returns:

an array of all prime numbers till the given number.

percentageOf

public static double percentageOf(double value,
                                  double percentage)

Calculates the percentage of the given value

Parameters:

value - The value

percentage - The percentage

Returns:

the result of the percentage of the given value

percentageOf

public static double percentageOf(float value,
                                  float percentage)

Calculates the percentage of the given value

Parameters:

value - The value

percentage - The percentage

Returns:

the result of the percentage of the given value

percentageOf

public static double percentageOf(int value,
                                  int percentage)

Calculates the percentage of the given value

Parameters:

value - The value

percentage - The percentage

Returns:

the result of the percentage of the given value

percentageOf

public static double percentageOf(long value,
                                  long percentage)

Calculates the percentage of the given value

Parameters:

value - The value

percentage - The percentage

Returns:

the result of the percentage of the given value

ruleOfThreeProportional

public static double ruleOfThreeProportional(double a,
                                             double b,
                                             double c)

Calculates the formula from rule of three in a proportional manner
Example: if 2 souflaki costs 8 dollar how much costs 5 souflaki
so a is 2 souflaki
and b is 8 dollar
and c is 5 souflaki

return x which is 20 dollar

Parameters:

a - the first value

b - the second value

c - the third value

Returns:

the result of the rule of three in a proportional manner