Thread: Help with Java Code.

Hi guys. Im having a bit of an issue with my java code here.
Basically what this code should do is:

1) Asks the user for their first name.
2) Takes that first name and generates a random number from it based on its length.
3) Take that number it generates from the length then prints it in the output as a CharAt();

I guess what my problem is really is the random number generation at the end of the code for a number been 100 and 999. I am not sure whether I have done it correctly.
Can anyone assist me with this.

Regards
Matt

import java.util.Random;
import java.util.Scanner;
 
public class AS1Q2 {
 
	public static void main(String[] args) {
 
		Scanner scan = new Scanner (System.in);
 
		String firstName;
 
		System.out.println ("Enter Your First Name: "); // Using print line will allow the user to enter their name below the Console txt showing "Enter Your Name: "
		firstName = scan.nextLine();
 
 
		Random random = new Random(); // Generates first value for Letter conversion //
 
		int nameGen1;
		nameGen1= random.nextInt(firstName.length()); 
 
		int nameGen2;
		nameGen2 = random.nextInt(firstName.length()); 
 
		int nameGen3;
		nameGen3 = random.nextInt(firstName.length()); 
 
		//Random genThree = new Random(); // Generates second value for Letter conversion - not required, left in as apart of Troubleshooting ---//
 
 
		//Random genFour = new Random(); // Generates third value for Letter conversion  - not required, left in as apart of Troubleshooting ---//
 
 
 
		//--------------------------Generates Last Three Numbers of Rego Between 100 and 999 -----------------------------------//
 
		Random generator = new Random();
		int randomEndNumber;
		randomEndNumber = generator.nextInt(900) + 100 - 1;
 
		//----Output---//
 
 
		System.out.println("Your Registration Number is: "+firstName.toUpperCase().charAt(nameGen1)+""+firstName.toUpperCase().charAt(nameGen2)+""+firstName.toUpperCase().charAt(nameGen3)+" "+randomEndNumber);
 
 
	}
 
}

Hello metalx66. Welcome to the Java Programming Forums.

This all looks correct to me. I have used System.out.println(); to see what values are being generated.

To make sure the randomEndNumber is working correctly, try reducing the range.

import java.util.Random;
import java.util.Scanner;
 
public class AS1Q2 {
 
	public static void main(String[] args) {
 
		Scanner scan = new Scanner (System.in); 
		String firstName;
 
		// Using print line will allow the user to enter their name below the Console txt showing "Enter Your Name: "
		System.out.println ("Enter Your First Name: "); 
		firstName = scan.nextLine();
 
		// Generates first value for Letter conversion //
		Random random = new Random(); 
 
		int nameGen1;
		nameGen1= random.nextInt(firstName.length()); 
		System.out.println (nameGen1); 
 
		int nameGen2;
		nameGen2 = random.nextInt(firstName.length());
		System.out.println (nameGen2); 
 
		int nameGen3;
		nameGen3 = random.nextInt(firstName.length());
		System.out.println (nameGen3); 
 
		// Generates second value for Letter conversion - not required, left in as apart of Troubleshooting ---//
		//Random genThree = new Random(); 
 
		 // Generates third value for Letter conversion  - not required, left in as apart of Troubleshooting ---//
		//Random genFour = new Random();
 
 
		//--------------------------Generates Last Three Numbers of Rego Between 100 and 999 -----------------------------------//
 
		Random generator = new Random();
		int randomEndNumber;
		randomEndNumber = generator.nextInt(900) + 100 - 1;
		System.out.println (randomEndNumber); 
 
		//----Output---//
 
		System.out.println("Your Registration Number is: "+firstName.toUpperCase().charAt(nameGen1)+""+firstName.toUpperCase().charAt(nameGen2)+""+firstName.toUpperCase().charAt(nameGen3)+" "+randomEndNumber);
 
	}
 
}