随机字符串生成算法-白红宇

IOS算法：

char

data[NUMBER_OF_CHARS];

for

(

int

x=0;x<NUMBER_OF_CHARS;data[x++] = (

char

)(

'A'

+ (arc4random_uniform(26))));

return

[[NSString alloc] initWithBytes:data length:NUMBER_OF_CHARS encoding:NSUTF8StringEncoding];

JAVA实现：

给定一个字符集合，给定随机生成的字符串的长度，即可随机生成字符串；

比如{'a','.....,'z'}及长度5，则随机生成一个长度为5的字符串；

[java]

package xiazdong.util;

import java.util.Random;

/*根据给定的char集合，生成随机的字符串*/

public class StringWidthWeightRandom {

private Random widthRandom = new Random();

private int length;

private char[] chars;

private Random random = new Random();

public StringWidthWeightRandom(char[] chars) {

this.chars = chars;

}

//参数为生成的字符串的长度，根据给定的char集合生成字符串

public String getNextString(int length){

char[] data = new char[length];

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

int index = random.nextInt(chars.length);

data[i] = chars[index];

}

String s = new String(data);

return s;

}

}

测试代码：

[java]

package test.com.sap.prd.util;

import junit.framework.TestCase;

import org.junit.Test;

import com.sap.prd.util.StringWidthWeightRandom;

public class StringWidthWeightRandomTest extends TestCase {

@Test

public void testGetNextString()throws Exception{

StringWidthWeightRandom random = new StringWidthWeightRandom(new char[]{
'A','B','C','D','E','F','G'});

for(int i=1;i<10;i++){

System.out.println(random.getNextString(i));

}

}

}

结果：

[java]

CADA

CFBFC

DBBCFE

BFEADFA

FDEEDACE

EEFFGFBEG

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