// 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

*/