随机类代码,Java代码库,德仔网

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【Java】随机类
作者: / 发布于2011/1/14/ 417
<div><span style="color: #008000">/*</span><span style="color: #008000">
* @author talent_marquis<?????>
* Email: talent_marquis@163.com
* Copyright (C) 2007 talent_marquis<?????>
* All rights reserved.
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">package</span><span style="color: #000000"> com.dextrys.trilogy.util;

</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Arrays;

</span><span style="color: #0000ff">import</span><span style="color: #000000"> org.eclipse.swt.graphics.RGB;

</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> RandomUtil
{

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> args
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main( String[] args )
 {
 </span><span style="color: #008000">//</span><span style="color: #008000">System.out.println( getRandomNormalString( 8 ) );</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000">[] test </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomIntWithoutReduplicate( </span><span style="color: #000000">0</span><span style="color: #000000">, </span><span style="color: #000000">40</span><span style="color: #000000">, </span><span style="color: #000000">39</span><span style="color: #000000"> );
 Arrays.sort( test );
 </span><span style="color: #0000ff">for</span><span style="color: #000000">( </span><span style="color: #0000ff">int</span><span style="color: #000000"> i : test )
 {
 System.out.println( i );
 }
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * get a integer array filled with random integer without reduplicate [min, max)
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> min the minimum value
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> max the maximum value
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> size the capacity of the array
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a integer array filled with random integer without redupulicate
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000">[] getRandomIntWithoutReduplicate( </span><span style="color: #0000ff">int</span><span style="color: #000000"> min, </span><span style="color: #0000ff">int</span><span style="color: #000000"> max, </span><span style="color: #0000ff">int</span><span style="color: #000000"> size )
 {
 </span><span style="color: #0000ff">int</span><span style="color: #000000">[] result </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000">[size];
 
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> arraySize </span><span style="color: #000000">=</span><span style="color: #000000"> max </span><span style="color: #000000">-</span><span style="color: #000000"> min;
 </span><span style="color: #0000ff">int</span><span style="color: #000000">[] intArray </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000">[arraySize];
 </span><span style="color: #008000">//</span><span style="color: #008000"> init intArray</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">for</span><span style="color: #000000">( </span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000"> ; i </span><span style="color: #000000"><</span><span style="color: #000000"> intArray.length ; i</span><span style="color: #000000">++</span><span style="color: #000000"> )
 {
 intArray[i] </span><span style="color: #000000">=</span><span style="color: #000000"> i </span><span style="color: #000000">+</span><span style="color: #000000"> min;
 }
 </span><span style="color: #008000">//</span><span style="color: #008000"> get randome interger without reduplicate</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">for</span><span style="color: #000000">( </span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000"> ; i </span><span style="color: #000000"><</span><span style="color: #000000"> size ; i</span><span style="color: #000000">++</span><span style="color: #000000"> )
 {
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> c </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomInt( min, max </span><span style="color: #000000">-</span><span style="color: #000000"> i );
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> index </span><span style="color: #000000">=</span><span style="color: #000000"> c </span><span style="color: #000000">-</span><span style="color: #000000"> min;
 swap( intArray, index, arraySize </span><span style="color: #000000">-</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000"> i );
 result[i] </span><span style="color: #000000">=</span><span style="color: #000000"> intArray[ arraySize </span><span style="color: #000000">-</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000"> i ];
 }
 
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }
 
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> swap( </span><span style="color: #0000ff">int</span><span style="color: #000000">[] array, </span><span style="color: #0000ff">int</span><span style="color: #000000"> x, </span><span style="color: #0000ff">int</span><span style="color: #000000"> y )
 {
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> temp </span><span style="color: #000000">=</span><span style="color: #000000"> array[x];
 array[x] </span><span style="color: #000000">=</span><span style="color: #000000"> array[y];
 array[y] </span><span style="color: #000000">=</span><span style="color: #000000"> temp;
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * get a random Integer with the range [min, max)
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> min the minimum value
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> max the maximum value
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> the random Integer value
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getRandomInt( </span><span style="color: #0000ff">int</span><span style="color: #000000"> min, </span><span style="color: #0000ff">int</span><span style="color: #000000"> max )
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> include min, exclude max</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> result </span><span style="color: #000000">=</span><span style="color: #000000"> min </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Double( Math.random() </span><span style="color: #000000">*</span><span style="color: #000000"> ( max </span><span style="color: #000000">-</span><span style="color: #000000"> min ) ).intValue();

 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * get a random double with the range [min, max)
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> min the minimum value
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> max the maximum value
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> the random double value
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">double</span><span style="color: #000000"> getRandomDouble( </span><span style="color: #0000ff">double</span><span style="color: #000000"> min, </span><span style="color: #0000ff">double</span><span style="color: #000000"> max )
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> include min, exclude max</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">double</span><span style="color: #000000"> result </span><span style="color: #000000">=</span><span style="color: #000000"> min </span><span style="color: #000000">+</span><span style="color: #000000"> ( Math.random() </span><span style="color: #000000">*</span><span style="color: #000000"> ( max </span><span style="color: #000000">-</span><span style="color: #000000"> min ) );
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a random char with the range ASCII 33(!) to ASCII 126(~)
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">char</span><span style="color: #000000"> getRandomChar()
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> from ASCII code 33 to ASCII code 126</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> firstChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">33</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000"> "!"</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> lastChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">126</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000"> "~"</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">char</span><span style="color: #000000"> result </span><span style="color: #000000">=</span><span style="color: #000000"> ( </span><span style="color: #0000ff">char</span><span style="color: #000000"> ) ( getRandomInt( firstChar, lastChar </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> ) );
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a random rgb color
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> RGB getRandomRGB()
 {
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> red </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomInt(</span><span style="color: #000000">0</span><span style="color: #000000">,</span><span style="color: #000000">256</span><span style="color: #000000">);
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> green </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomInt(</span><span style="color: #000000">0</span><span style="color: #000000">,</span><span style="color: #000000">256</span><span style="color: #000000">);
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> blue </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomInt(</span><span style="color: #000000">0</span><span style="color: #000000">,</span><span style="color: #000000">256</span><span style="color: #000000">);
 
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> RGB( red, green, blue );
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a random char with the range [0-9],[a-z],[A-Z]
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">char</span><span style="color: #000000"> getRandomNormalChar()
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> include 0-9,a-z,A-Z</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> number </span><span style="color: #000000">=</span><span style="color: #000000"> getRandomInt( </span><span style="color: #000000">0</span><span style="color: #000000">, </span><span style="color: #000000">62</span><span style="color: #000000"> );
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> zeroChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">48</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> nineChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">57</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> aChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">97</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> zChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">122</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> AChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">65</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> ZChar </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">90</span><span style="color: #000000">;
 
 </span><span style="color: #0000ff">char</span><span style="color: #000000"> result;
 
 </span><span style="color: #0000ff">if</span><span style="color: #000000">( number </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">10</span><span style="color: #000000"> )
 {
 result </span><span style="color: #000000">=</span><span style="color: #000000"> ( </span><span style="color: #0000ff">char</span><span style="color: #000000"> ) ( getRandomInt( zeroChar, nineChar </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> ) );
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;

 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000">( number </span><span style="color: #000000">>=</span><span style="color: #000000"> </span><span style="color: #000000">10</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> number </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">36</span><span style="color: #000000"> )
 {
 result </span><span style="color: #000000">=</span><span style="color: #000000"> ( </span><span style="color: #0000ff">char</span><span style="color: #000000"> ) ( getRandomInt( AChar, ZChar </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> ) );
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000">( number </span><span style="color: #000000">>=</span><span style="color: #000000"> </span><span style="color: #000000">36</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> number </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">62</span><span style="color: #000000"> )
 {
 result </span><span style="color: #000000">=</span><span style="color: #000000"> ( </span><span style="color: #0000ff">char</span><span style="color: #000000"> ) ( getRandomInt( aChar, zChar </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000"> ) );
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">;
 }
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> length the length of the String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a String filled with random char
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getRandomString( </span><span style="color: #0000ff">int</span><span style="color: #000000"> length )
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> include ASCII code from 33 to 126</span><span style="color: #008000">
</span><span style="color: #000000"> StringBuffer result </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer();
 </span><span style="color: #0000ff">for</span><span style="color: #000000">( </span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> length; i</span><span style="color: #000000">++</span><span style="color: #000000"> )
 {
 result.append( getRandomChar() );
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result.toString();
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> length the length of the String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> a String filled with normal random char
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getRandomNormalString( </span><span style="color: #0000ff">int</span><span style="color: #000000"> length )
 {
 </span><span style="color: #008000">//</span><span style="color: #008000"> include 0-9,a-z,A-Z</span><span style="color: #008000">
</span><span style="color: #000000"> StringBuffer result </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer();
 </span><span style="color: #0000ff">for</span><span style="color: #000000">( </span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> length; i</span><span style="color: #000000">++</span><span style="color: #000000">)
 {
 result.append( getRandomNormalChar() );
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result.toString();
 }
}

</span></div>
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