Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

How to create a java program that generates and prints a random phone number in the form xxx-xxx-xxxx

Posted on 2004-10-12
9
Medium Priority
?
286 Views
Last Modified: 2012-08-14
Thats basically what i need to know in a nutshell.....
these are the parameters
-The first digit can't be a zero
-The first 3 digits can't contain an 8 or 9
-the second set of 3 digits cant begin with a zero
-the second set of 3 digits cant be greater than 610
-The first digit of the last set of digits cant be a zero

(ultimately i need it written in java form)
0
Comment
Question by:vsands
  • 6
9 Comments
 
LVL 37

Expert Comment

by:zzynx
ID: 12286275
What do you have already?
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286292
We're not here to write a complete programs for you. (Lots of other sites exist for that)
We're here to help you with problems you might have when writing your program
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286313
Use java.util.Random.nextInt() to generate the parts of your telephone number
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 37

Accepted Solution

by:
zzynx earned 200 total points
ID: 12286387
This can give you an idea:

String digits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
StringBuffer telephoneNr = new StringBuffer();
Random rd = new Random();

// Generate first digit (which shouldn't be 0, 8 or 9)
String tmp;
do {
   tmp = digits[ rd.nextInt(8) ];
} while ( !tmp.equals("0") );
telephoneNr.append(tmp);

for (int i=1; i<=2; i++) { // Generate 2nd/3rd digit (which shouldn't be 8 or 9)
    do {
       tmp = digits[ rd.nextInt(10) ];
    } while ( !tmp.equals("0") );
    telephoneNr.append(tmp);
}

...
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286400
Typo:

    tmp = digits[ rd.nextInt(10) ];

should be

    tmp = digits[ rd.nextInt(8) ];   // since 8 and 9 shouldn't be "picked"
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12286503
Or easier:

StringBuffer telephoneNr = new StringBuffer();
Random rd = new Random();

// Generate first part
String tmp;
do {
   tmp = "" + (100 + rd.nextInt(900));
} while ( tmp.indexOf("8")!=-1 || tmp.indexOf("9")!=-1 );
telephoneNr.append(tmp);

telephoneNr.append("-");

// Generate 2nd part
tmp = "" + (100 + rd.nextInt(511));
telephoneNr.append(tmp);

telephoneNr.append("-");

// Generate 3rd part
tmp = "" + (1000 + rd.nextInt(9000));
telephoneNr.append(tmp);

System.out.println( telephoneNr.toString() );
0
 
LVL 2

Expert Comment

by:shah1d1698
ID: 12321679
Try this code.. Compile & run the program.


public class Application1
{

  String finalString = null;
  public void generateNumber()
  {
    int p1 = 0, p2 = 0, p3 = 0;
    String s1 = null, s2 = null, s3 = null;


    while(true)
    {
      p1 = (int) (Math.random() * 1000);
      String temp = "" + p1;
      int tempFlag = 0;
      for(int i = 0; i < temp.length();i ++)
      {
        if(temp.charAt(i) == '8' || temp.charAt(i) == '9')
        {
          tempFlag = 1;
        }
      }
      if(p1 > 100 && tempFlag == 0)
        break;
    }

    finalString = "" + p1;

    while(true)
    {
      p2 = (int) (Math.random() * 1000);
      if(p2 > 100 && p2 < 610)
        break;
    }

    finalString = finalString + "-" + p2;

    while(true)
    {
      p3 = (int) (Math.random() * 10000);
      if(p3 > 1000)
        break;
    }

    finalString = finalString + "-" + p3;

    System.out.println(finalString);

  }

  public static void main(String args[])
  {
    Application1 app = new Application1();
    for(int i = 0; i < 1000; i++) // this will generate 1000 numbers..
    {
      app.generateNumber();
    }
  }
}
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
Suggested Courses

927 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question