org.aoju.bus.extra.captcha

Class Randoms

java.lang.Object

org.aoju.bus.extra.captcha.Randoms

Direct Known Subclasses:

BaseCaptcha

public class Randoms
extends Object

随机数工具类 Created by 王帆 on 2018-07-27 上午 10:08.

Field Summary

Fields

Modifier and Type	Field and Description
static char[]	ALPHA
protected static int	charMaxIndex
protected static int	charMinIndex
protected static int	lowerMaxIndex
protected static int	lowerMinIndex
protected static int	numMaxIndex
protected static Random	RANDOM
protected static int	upperMaxIndex
protected static int	upperMinIndex

Constructor Summary

Constructors

Constructor and Description
Randoms()

Method Summary

Modifier and Type	Method and Description
static char	alpha() 返回ALPHA中的随机字符
static char	alpha(int num) 返回ALPHA中第0位到第num位的随机字符
static char	alpha(int min, int max) 返回ALPHA中第min位到第max位的随机字符
static int	num(int num) 产生0-num的随机数,不包括num
static int	num(int min, int max) 产生两个数之间的随机数

Methods inherited from class java.lang.Object

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

Field Detail

RANDOM

protected static final Random RANDOM

ALPHA

public static final char[] ALPHA

numMaxIndex

protected static final int numMaxIndex

See Also:

Constant Field Values

charMinIndex

protected static final int charMinIndex

See Also:

Constant Field Values

charMaxIndex

protected static final int charMaxIndex

upperMinIndex

protected static final int upperMinIndex

See Also:

Constant Field Values

upperMaxIndex

protected static final int upperMaxIndex

See Also:

Constant Field Values

lowerMinIndex

protected static final int lowerMinIndex

See Also:

Constant Field Values

lowerMaxIndex

protected static final int lowerMaxIndex

Constructor Detail

Randoms

public Randoms()

Method Detail

num

public static int num(int min,
                      int max)

产生两个数之间的随机数

Parameters:

min - 最小值

max - 最大值

Returns:

随机数

num

public static int num(int num)

产生0-num的随机数,不包括num

Parameters:

num - 最大值

Returns:

随机数

alpha

public static char alpha()

返回ALPHA中的随机字符

Returns:

随机字符

alpha

public static char alpha(int num)

返回ALPHA中第0位到第num位的随机字符

Parameters:

num - 到第几位结束

Returns:

随机字符

alpha

public static char alpha(int min,
                         int max)

返回ALPHA中第min位到第max位的随机字符

Parameters:

min - 从第几位开始

max - 到第几位结束

Returns:

随机字符