cn.trinea.android.common.util

Class RandomUtils

java.lang.Object

cn.trinea.android.common.util.RandomUtils

public class RandomUtils
extends java.lang.Object

Random Utils

Shuffling algorithm
• shuffle(Object[]) Shuffling algorithm, Randomly permutes the specified array using a default source of randomness
• shuffle(Object[], int) Shuffling algorithm, Randomly permutes the specified array
• shuffle(int[]) Shuffling algorithm, Randomly permutes the specified int array using a default source of randomness
• shuffle(int[], int) Shuffling algorithm, Randomly permutes the specified int array

get random int
• getRandom(int) get random int between 0 and max
• getRandom(int, int) get random int between min and max

get random numbers or letters
• getRandomCapitalLetters(int) get a fixed-length random string, its a mixture of uppercase letters
• getRandomLetters(int) get a fixed-length random string, its a mixture of uppercase and lowercase letters
• getRandomLowerCaseLetters(int) get a fixed-length random string, its a mixture of lowercase letters
• getRandomNumbers(int) get a fixed-length random string, its a mixture of numbers
• getRandomNumbersAndLetters(int) get a fixed-length random string, its a mixture of uppercase, lowercase letters and numbers
• getRandom(String, int) get a fixed-length random string, its a mixture of chars in source
• getRandom(char[], int) get a fixed-length random string, its a mixture of chars in sourceChar

Author:

Trinea 2012-5-12

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CAPITAL_LETTERS
static java.lang.String	LETTERS
static java.lang.String	LOWER_CASE_LETTERS
static java.lang.String	NUMBERS
static java.lang.String	NUMBERS_AND_LETTERS

Constructor Summary

Constructors

Constructor and Description
RandomUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static java.lang.String	getRandom(char[] sourceChar, int length) get a fixed-length random string, its a mixture of chars in sourceChar
static int	getRandom(int max) get random int between 0 and max
static int	getRandom(int min, int max) get random int between min and max
static java.lang.String	getRandom(java.lang.String source, int length) get a fixed-length random string, its a mixture of chars in source
static java.lang.String	getRandomCapitalLetters(int length) get a fixed-length random string, its a mixture of uppercase letters
static java.lang.String	getRandomLetters(int length) get a fixed-length random string, its a mixture of uppercase and lowercase letters
static java.lang.String	getRandomLowerCaseLetters(int length) get a fixed-length random string, its a mixture of lowercase letters
static java.lang.String	getRandomNumbers(int length) get a fixed-length random string, its a mixture of numbers
static java.lang.String	getRandomNumbersAndLetters(int length) get a fixed-length random string, its a mixture of uppercase, lowercase letters and numbers
static int[]	shuffle(int[] intArray) Shuffling algorithm, Randomly permutes the specified int array using a default source of randomness
static int[]	shuffle(int[] intArray, int shuffleCount) Shuffling algorithm, Randomly permutes the specified int array
static boolean	shuffle(java.lang.Object[] objArray) Shuffling algorithm, Randomly permutes the specified array using a default source of randomness
static boolean	shuffle(java.lang.Object[] objArray, int shuffleCount) Shuffling algorithm, Randomly permutes the specified array

Methods inherited from class java.lang.Object

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

Field Detail

NUMBERS_AND_LETTERS

public static final java.lang.String NUMBERS_AND_LETTERS

See Also:

Constant Field Values

NUMBERS

public static final java.lang.String NUMBERS

See Also:

Constant Field Values

LETTERS

public static final java.lang.String LETTERS

See Also:

Constant Field Values

CAPITAL_LETTERS

public static final java.lang.String CAPITAL_LETTERS

See Also:

Constant Field Values

LOWER_CASE_LETTERS

public static final java.lang.String LOWER_CASE_LETTERS

See Also:

Constant Field Values

Constructor Detail

RandomUtils

public RandomUtils()

Method Detail

getRandomNumbersAndLetters

public static java.lang.String getRandomNumbersAndLetters(int length)

get a fixed-length random string, its a mixture of uppercase, lowercase letters and numbers

Parameters:

length -

Returns:

See Also:

getRandom(String source, int length)

getRandomNumbers

public static java.lang.String getRandomNumbers(int length)

get a fixed-length random string, its a mixture of numbers

Parameters:

length -

Returns:

See Also:

getRandom(String source, int length)

getRandomLetters

public static java.lang.String getRandomLetters(int length)

get a fixed-length random string, its a mixture of uppercase and lowercase letters

Parameters:

length -

Returns:

See Also:

getRandom(String source, int length)

getRandomCapitalLetters

public static java.lang.String getRandomCapitalLetters(int length)

get a fixed-length random string, its a mixture of uppercase letters

Parameters:

length -

Returns:

See Also:

getRandom(String source, int length)

getRandomLowerCaseLetters

public static java.lang.String getRandomLowerCaseLetters(int length)

get a fixed-length random string, its a mixture of lowercase letters

Parameters:

length -

Returns:

See Also:

getRandom(String source, int length)

getRandom

public static java.lang.String getRandom(java.lang.String source,
                         int length)

get a fixed-length random string, its a mixture of chars in source

Parameters:

source -

length -

Returns:

• if source is null or empty, return null
• else see getRandom(char[] sourceChar, int length)

getRandom

public static java.lang.String getRandom(char[] sourceChar,
                         int length)

get a fixed-length random string, its a mixture of chars in sourceChar

Parameters:

sourceChar -

length -

Returns:

• if sourceChar is null or empty, return null
• if length less than 0, return null

getRandom

public static int getRandom(int max)

get random int between 0 and max

Parameters:

max -

Returns:

• if max <= 0, return 0
• else return random int between 0 and max

getRandom

public static int getRandom(int min,
            int max)

get random int between min and max

Parameters:

min -

max -

Returns:

• if min > max, return 0
• if min == max, return min
• else return random int between min and max

shuffle

public static boolean shuffle(java.lang.Object[] objArray)

Shuffling algorithm, Randomly permutes the specified array using a default source of randomness

Parameters:

objArray -

Returns:

shuffle

public static boolean shuffle(java.lang.Object[] objArray,
              int shuffleCount)

Shuffling algorithm, Randomly permutes the specified array

Parameters:

objArray -

shuffleCount -

Returns:

shuffle

public static int[] shuffle(int[] intArray)

Shuffling algorithm, Randomly permutes the specified int array using a default source of randomness

Parameters:

intArray -

Returns:

shuffle

public static int[] shuffle(int[] intArray,
            int shuffleCount)

Shuffling algorithm, Randomly permutes the specified int array

Parameters:

intArray -

shuffleCount -

Returns: