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 { @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：

F CC EGE CADA CFBFC DBBCFE BFEADFA FDEEDACE EEFFGFBEG