Question

Task #3 Working with Strings 1. Use the charAt method to get the first character in firstName and store it in a variable called firstInitial. 2. Print out the user’s first initial. 3. Use the toUpperCase method to change the fullName to upper and store it back into the fullName variable. 4. Add a line that prints out tha value of fullName and how many characters are in the string stored in fullName

java

Answer 1

Solution Overview:

This task can be performed by using the following functions:

1. string.charAt(index) : This function returns the character at the specified index in a string.
For example to extract the first char from string s and store it in temp variable, the following statement has to be written:
char temp = s.charAt(0);

2. string.toUpperCase(): This function converts all the lower case alphabetical characters in the string into upper case alphabetical characters.
For example to convert string temp into uppercase and store it back to temp, we write the following statement:
temp = temp.toUpperCase();

3. string.length(): This function finds the number of characters in the string. This function also counts spaces in between the string.
For example, to find the number of characters in string temp and store it into an integer size, we write the following statement:
int size = temp.length()

Code:

import java.util.*;

class Main

{

public static void main(String[] args)

{

//Creating an object of scanner class to accept input from the user

Scanner sc = new Scanner(System.in);

//String firstName and fullName will contain the name user enters

String firstName,fullName;

System.out.print("Enter the first name of the user: ");

firstName = sc.nextLine();

//Using sc.nextLine() function to accept the full name of user along with space in between

System.out.print("Enter the first name of the user: ");

fullName = sc.nextLine();

//using charAt() function to extract the first character in the user's name. This will be the first Initial of the user's full name.

char firstInitial = firstName.charAt(0);

//Printing the first Initial to the user

System.out.println("User's First Initial: "+firstInitial);

//Convertinig fullName to uppercase using toUpperCase() function and storing it in fullName again

fullName = fullName.toUpperCase();

//Printing the fullName in upper case

System.out.println("User's Name in UpperCase: "+fullName);

//Using length() function to find the length of the string and storing it in variable size.

int size = fullName.length();

//Printing the size to the user.

System.out.println("Size of User's Name is: "+size);

//closing the scanner

sc.close();

}

}

Sample Output: