Java

Generating Random ASCII Strings

See more PRNG Examples

Demonstrates how to generate random us-ascii strings. Java

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[])
  {
    boolean success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    success = false;

    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));
        }
  }
}