Generates a random phone number

PhoneNum.java

import java.util.*;
 
public class Phone
{
    public static void main(String[] args)
    {
        int num1, num2, num3; //3 numbers in area code
        int set2, set3; //sequence 2 and 3 of the phone number
        
        Random generator = new Random();
        
        //Area code number; Will not print 8 or 9
        num1 = generator.nextInt(7) + 1; //add 1 so there is no 0 to begin  
        num2 = generator.nextInt(8); //randomize to 8 becuase 0 counts as a number in the generator
        num3 = generator.nextInt(8);
        
        // Sequence two of phone number
        // the plus 100 is so there will always be a 3 digit number
        // randomize to 643 because 0 starts the first placement so if i randomized up to 642 it would only go up yo 641 plus 100
        // and i used 643 so when it adds 100 it will not succeed 742 
        set2 = generator.nextInt(643) + 100;
        
        //Sequence 3 of numebr
        // add 1000 so there will always be 4 numbers
        //8999 so it wont succed 9999 when the 1000 is added
        set3 = generator.nextInt(8999) + 1000;
        
        System.out.println ( "(" + num1 + "" + num2 + "" + num3 + ")" + "-" + set2 + "-" + set3 );
        
    }
}

thnx