随机生成字符串兑现

随机生成字符串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

随机生成字符串实现

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；

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：

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 {@Testpublic 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：

FCCEGECADACFBFCDBBCFEBFEADFAFDEEDACEEEFFGFBEG