// interfaces/RandomStrings.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Implementing an interface to conform to a method
import java.nio.*;
import java.util.*;

public class RandomStrings implements Readable {
 private static Random rand = new Random(47);
 private static final char[] CAPITALS =
 "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
 private static final char[] LOWERS =
 "abcdefghijklmnopqrstuvwxyz".toCharArray();
 private static final char[] VOWELS =
 "aeiou".toCharArray();
 private int count;
 public RandomStrings(int count) {
 this.count = count;
 }
 @Override
 public int read(CharBuffer cb) {
 if(count-- == 0)
 return -1; // Indicates end of input
 cb.append(CAPITALS[rand.nextInt(CAPITALS.length)]);
 for(int i = 0; i < 4; i++) {
 cb.append(VOWELS[rand.nextInt(VOWELS.length)]);
 cb.append(LOWERS[rand.nextInt(LOWERS.length)]);
 }
 cb.append(" ");
 return 10; // Number of characters appended
 }
 public static void main(String[] args) {
 Scanner s = new Scanner(new RandomStrings(10));
 while(s.hasNext())
 System.out.println(s.next());
 }
}
/* Output:
Yazeruyac
Fowenucor
Goeazimom
Raeuuacio
Nuoadesiw
Hageaikux
Ruqicibui
Numasetih
Kuuuuozog
Waqizeyoy
*/