RandomUtils (xutil-sub 1.1.6 API)

java.lang.Object
- com.xuexiang.xutil.common.RandomUtils

```
public final class RandomUtils
extends java.lang.Object
```
```
     desc   : Random Utils
     author : xuexiang
     time   : 2018/4/28 上午12:41
 
```
- 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
- getRandom(int) get random int between 0 and max
- getRandom(int, int) get random int between min and max
- 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

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`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static java.lang.String`	`getRandom(char[] sourceChar, int length)` 在一个字符数组源中获取一个定长的随机字符串
`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)` 在一个字符数组源中获取一个定长的随机字符串
`static java.lang.String`	`getRandomCapitalLetters(int length)` 在大写英文字母中获取一个定长的随机字符串
`static int`	`getRandomColor()` 获取随机颜色
`static java.lang.String`	`getRandomLetters(int length)` 在英文字母中获取一个定长的随机字符串
`static java.lang.String`	`getRandomLowerCaseLetters(int length)` 在小写英文字母中获取一个定长的随机字符串
`static java.lang.String`	`getRandomNumbers(int length)` 在数字中获取一个定长的随机字符串
`static java.lang.String`	`getRandomNumbersAndLetters(int length)` 在数字和英文字母中获取一个定长的随机字符串
`static int[]`	`shuffle(int[] intArray)` 随机打乱数组中的内容
`static int[]`	`shuffle(int[] intArray, int shuffleCount)` 随机打乱数组中的内容
`static boolean`	`shuffle(java.lang.Object[] objArray)` 随机打乱数组中的内容
`static boolean`	`shuffle(java.lang.Object[] objArray, int shuffleCount)` 随机打乱数组中的内容

Methods inherited from class java.lang.Object
clone, equals, finalize, 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
- Method Detail
  - getRandomNumbersAndLetters
```
public static java.lang.String getRandomNumbersAndLetters(int length)
```
    在数字和英文字母中获取一个定长的随机字符串
    
    Parameters:
    
    length - 长度
    
    Returns:
    
    随机字符串
    
    See Also:
    
    getRandom(String source, int length)
  - getRandomNumbers
```
public static java.lang.String getRandomNumbers(int length)
```
    在数字中获取一个定长的随机字符串
    
    Parameters:
    
    length - 长度
    
    Returns:
    
    随机数字符串
    
    See Also:
    
    getRandom(String source, int length)
  - getRandomLetters
```
public static java.lang.String getRandomLetters(int length)
```
    在英文字母中获取一个定长的随机字符串
    
    Parameters:
    
    length - 长度
    
    Returns:
    
    随机字母字符串
    
    See Also:
    
    getRandom(String source, int length)
  - getRandomCapitalLetters
```
public static java.lang.String getRandomCapitalLetters(int length)
```
    在大写英文字母中获取一个定长的随机字符串
    
    Parameters:
    
    length - 长度
    
    Returns:
    
    随机字符串只包含大写字母
    
    See Also:
    
    getRandom(String source, int length)
  - getRandomLowerCaseLetters
```
public static java.lang.String getRandomLowerCaseLetters(int length)
```
    在小写英文字母中获取一个定长的随机字符串
    
    Parameters:
    
    length - 长度
    
    Returns:
    
    随机字符串只包含小写字母
    
    See Also:
    
    getRandom(String source, int length)
  - getRandom
```
public static java.lang.String getRandom(java.lang.String source,
                                         int length)
```
    在一个字符数组源中获取一个定长的随机字符串
    Parameters:
    
    source - 源字符串
    
    length - 长度
    
    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)
```
    在一个字符数组源中获取一个定长的随机字符串
    Parameters:
    
    sourceChar - 字符数组源
    
    length - 长度
    
    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 - 最大随机数
    
    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 - 最小随机数
    
    max - 最大随机数
    
    Returns:
    if min > max, return 0
    
    if min == max, return min
    
    else return random int between min and max
  - getRandomColor
```
public static int getRandomColor()
```
    获取随机颜色
    
    Returns:
  - shuffle
```
public static boolean shuffle(java.lang.Object[] objArray)
```
    随机打乱数组中的内容
    
    Parameters:
    
    objArray -
    
    Returns:
  - shuffle
```
public static boolean shuffle(java.lang.Object[] objArray,
                              int shuffleCount)
```
    随机打乱数组中的内容
    
    Parameters:
    
    objArray -
    
    shuffleCount -
    
    Returns:
  - shuffle
```
public static int[] shuffle(int[] intArray)
```
    随机打乱数组中的内容
    
    Parameters:
    
    intArray -
    
    Returns:
  - shuffle
```
public static int[] shuffle(int[] intArray,
                            int shuffleCount)
```
    随机打乱数组中的内容
    
    Parameters:
    
    intArray -
    
    shuffleCount -
    
    Returns:

Class RandomUtils

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NUMBERS_AND_LETTERS

NUMBERS

LETTERS

CAPITAL_LETTERS

LOWER_CASE_LETTERS

Method Detail

getRandomNumbersAndLetters

getRandomNumbers

getRandomLetters

getRandomCapitalLetters

getRandomLowerCaseLetters

getRandom

getRandom

getRandom

getRandom

getRandomColor

shuffle

shuffle

shuffle

shuffle