How do I do this code in java

Question

1.00/5 (2 votes)

See more:

I need to create a code which randomly generates 1 million different vehicle registration plates.
The plates need:
- to consist of 3 numbers
- to consist of 3 letters excluding vowels
-the letters and numbers need to be separated by a dash
- a randomly generated country code needs to be added to the end of the plate, it needs to be one of the following ( CA, ZN, MP, EC, L, GP, NC, FS, NW)
- everything needs to be displayed in a GUI and when you press the generate button it generates everything

What I have tried:

I have tried creating arrays and for loops and my code is not working

Posted 7-May-18 9:42am

Member 13815974

Updated 7-May-18 22:29pm

Add a Solution

Comments

Patrice T 7-May-18 15:59pm

Show your code and describe problem you have.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2018-05-07T21:31:00

Solution 1

Trail: Creating a GUI With JFC/Swing (The Java™ Tutorials)[^], Random (Java Platform SE 8 )[^].

Although, showing a million items on the GUI in one go will really annoy your users.

Posted 7-May-18 21:31pm

Richard MacCutchan

v4

Comments

Maciej Los 8-May-18 5:34am

5ed!

CPallini · Answer 2 · 2018-05-07T22:31:00

Assuming five vowels (that is considering 'Y' a consonant), you could have

10 ^ 3 * 21 ^ 3 * 9 = 83349000

different plates.

So you can choose a random number in the [0..83348999] range and generate the plate string using it. I am going to show you the code:

Java

import java.util.Random;

class Plate
{
  static final int PLATES = 83349000;
  static String plate(int n)
  {
    char [] dgt = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
    char [] letter = { 'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z' };
    String [] cc = { "CA", "ZN", "MP", "EC", "L", "GP", "NC", "FS", "NW" };

    String p = "";

    if ( n<0 || n >= PLATES) return p;
    int rem;
    for ( int i = 0; i<3; i++)
    {
      rem = n % 10;
      p += dgt[rem];
      n = (n - rem) / 10;
    }
    p += "-";

    for ( int i = 0; i<3; i++)
    {
      rem = n % 21;
      p += letter[rem];
      n = (n - rem) / 21;
    }
    p += "-";
    rem = n % 9;
    p += cc[rem];
    return p;
  }

  public static void main(String arg[])
  {
    int n;
    Random rand = new Random();
    // generate and show 10 random plates (repetition is allowed)
    for (n=0; n<10; ++n)
    {
      int r = rand.nextInt(PLATES);
      System.out.printf( "%3d %s\n", (n+1), plate( r) );
    }

  }
}

Now you have to generate 1000000 of such plates (and I assume) avoiding repetitions.
You could use (if your programming box has enough memory) the algorithm shown here: Random extraction of 5 cards from a deck[^] to make the trick.

Finally you have to create a GUI for it, possibly using, as suggested the Swing Framework. This artistic step is very up to you.