(Java) Generating Random ASCII Strings

Demonstrates how to generate random us-ascii strings.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // All Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        System.out.println(chilkatGlob.lastErrorText());
        return;
        }

    CkPrng fortuna = new CkPrng();

    boolean bDigits;
    boolean bLowercase;
    boolean bUppercase;

    // Generate random strings having only lowercase chars (a-z)
    // Disallow digits and uppercase and only allow lowercase
    bDigits = false;
    bUppercase = false;
    bLowercase = true;

    int i;

    System.out.println("-- only lowercase alpha (a-z)");
    for (i = 1; i <= 10; i++) {
        // Generate 20-character strings.
        System.out.println(fortuna.randomString(20,bDigits,bLowercase,bUppercase));
        }

    // Allow both lowercase and uppercase alpha chars
    bUppercase = true;
    System.out.println("-- lower and uppercase alpha (a-zA-Z)");
    for (i = 1; i <= 10; i++) {
        // Generate 20-character strings.
        System.out.println(fortuna.randomString(20,bDigits,bLowercase,bUppercase));
        }

    // Allow digits (0-9)
    bDigits = true;
    System.out.println("-- digits and lower/uppercase alpha (0-9a-zA-Z)");
    for (i = 1; i <= 10; i++) {
        // Generate 20-character strings.
        System.out.println(fortuna.randomString(20,bDigits,bLowercase,bUppercase));
        }

    // Allow only digits (0-9)
    bUppercase = false;
    bLowercase = false;
    System.out.println("-- only digits (0-9)");
    for (i = 1; i <= 10; i++) {
        // Generate 20-character strings.
        System.out.println(fortuna.randomString(20,bDigits,bLowercase,bUppercase));
        }
  }
}