Generate a Random String using Apache Commons Lang

<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>20030203.000129</version>
</dependency>
The class we are interested in is RandomStringUtils. Listed below are some functions you may find useful.
Generate and print a random string of length 5 from all characters available
System.out.println(RandomStringUtils.random(5));
Generate and print random string of length 10 from upper and lower case alphabets
System.out.println(RandomStringUtils.randomAlphabetic(10));
Generate and print a random number of length 12
System.out.println(RandomStringUtils.randomNumeric(12));
Generate and print a random string of length 5 using only a, b, c and d characters
System.out.println(RandomStringUtils.random(10,new char[]{'a','b','c','d'}));