import java.util.*;

// fill in an array with random integers

public class RandomStringBuffers {

    public static void main (String [] args)  {
	// create the array
	StringBuffer [] sb = new StringBuffer[9];
	StringBuffer monkeys = new StringBuffer("n little monkeys");
	Random r = new Random();

	// read the elements
	for (int i = 0; i < sb.length; ++i) {
	    monkeys.deleteCharAt(0);
	    sb[i] = monkeys.insert(0,r.nextInt(10));
	}

	// print out the elements to check:
	for (int i = 0; i < sb.length; ++i) {
	    System.out.println("sb[" + i +"] = " + sb[i]);
	}	
    }
}


This is an example from CSci 1211 course.