Write an application called nameapp that prompts for and reads the user’s first and last name (separately). then print a string composed of the first letter of the user’s first name, followed by the first five characters of the user’s last name, followed by a random integer in the range 10 to 99. assume that the last name is at least five letters long. similar algorithms are sometimes used to generate usernames for a new computer accounts.

The program to this question can be given as:

Program:

import java.util.*; //import java util package for input.  

public class NameApp //define class.  

{  

public static void main(String[] args) //define main method.  

{  

String First_Name,Last_Name,generate_username; //define Variables  

Scanner ob = new Scanner(System.in); //creating Scanner class object.  

System.out.println("Please Enter First Name: "); //prompt-1 for first name.  

First_Name=ob.next(); //input first name.  

System.out.print("Please Enter Last Name: "); //prompt-2 for last name.  

Last_Name=ob.next(); //input Last name.  

System.out.print("Name you insert is:"+First_Name+" "+Last_Name); //Display First_Name and Last_Name.  

int addnumber= 10 + (int)(Math.random()*99); //use random function for number (10-99).  

generate_username=First_Name.substring(0,1)+Last_Name.substring(0,5)+addnumber; //First_Name+Last_Name+addnumber  

System.out.print("Your generated name is:"+generate_username); //display generated name..  

}  

}

Output:  

Please Enter First Name: ABCDE

Please Enter Last Name: PQRST

Name you insert is: ABCDE PQRST

Your generated name is: APQRST34

Explanation:

The explanation of the program can be given as:

First, we import the java util package in this package there are many packages like Scanner class. This class is used for taking user input from the user. We define a class i.e. NameAPP. In this class, we define a variable that is already given in the question. After declaring a variable we create a scanner class object to take input from the user. Then we print the name that is inserted by the user. Then we use the random function. It is a math function that is used for print random integer values between the range. Then we declare the variable generated_username that's datatype is string because the string is a sequence of character. It holds the whole value. To print the generated value we use the print function i.e. System.out.print() or we can also use the System.out.println(). Where print() is used for print in that line and println() is used for print in the next line.