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java 隨機(jī)加強(qiáng)

package com.upengs.util;

/**

* <ul>

* <li>Title:[RandomGenerator]</li>

* <li>Description: [隨機(jī)生成器]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @version 1.0

public class RandomGenerator

{

/**

* <ul>

* <li>Description:[得到一個(gè)小寫字母]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @return

public static String getLower()

{

return String.valueOf((char) getIntRange(97, 122));

}

/**

* <ul>

* <li>Description:[隨機(jī)得到多個(gè)小寫字母]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param length

* @return

public static String getLowers(int length)

{

StringBuffer lowers = new StringBuffer();

for (int i = 0; i < length; i++)

{

lowers.append(getLower());

}

return lowers.toString();

}

/**

* <ul>

* <li>Description:[得到一個(gè)大寫字母]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @return

public static String getUpper()

{

return String.valueOf((char) getIntRange(65, 90));

}

/**

* <ul>

* <li>Description:[隨機(jī)得到多個(gè)大寫字母]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param length

* @return

public static String getUppers(int length)

{

StringBuffer upper = new StringBuffer();

for (int i = 0; i < length; i++)

{

upper.append(getUpper());

}

return upper.toString();

}

/**

* <ul>

* <li>Description:[隨機(jī)得到大寫字母或小寫字母]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @return

public static String getAlpha()

{

if (getIntRange(0, 1) == 0)

{

return getUpper();

}

return getLower();

}

/**

* <ul>

* <li>Description:[隨機(jī)得到一個(gè)由大小字母或小寫字母的字符串]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param length

* @return

public static String getAlphas(int length)

{

StringBuffer alphas = new StringBuffer();

for (int i = 0; i < length; i++)

{

alphas.append(getUpper());

}

return alphas.toString();

}

/**

* <ul>

* <li>Description:[得到一個(gè)字母或數(shù)字]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @return

public static String getBeta()

{

if (getIntRange(0, 1) == 0)

{

return getAlpha();

}

return String.valueOf(getIntRange(0, 9));

}

/**

* <ul>

* <li>Description:[隨機(jī)得到一個(gè)字母或數(shù)字的字符串]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param length

* @return

public static String getBetas(int length)

{

StringBuffer betas = new StringBuffer();

for (int i = 0; i < length; i++)

{

betas.append(getBeta());

}

return betas.toString();

}

/**

* <ul>

* <li>Description:[隨機(jī)生成某個(gè)范圍內(nèi)的隨機(jī)數(shù),包含兩端的數(shù)]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param start

* @param end

* @return

public static int getIntRange(int start, int end)

{

return (int) (Math.random() * (end - start + 1) + start);

}

/**

* <ul>

* <li>Description:[得到一個(gè)隨機(jī)整數(shù)]</li>

* <li>Created by [Huyvanpull] [2011-2-25]</li>

* <li>Midified by [modifier] [modified time]</li>

* </ul>

* @param end

* @return

public static int getInt(int end)

{

return getIntRange(0, end);

}

posted on 2011-02-25 22:16 HUIKK 閱讀(321) 評(píng)論(0) 編輯收藏所屬分類: Java

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