how to convert a string name into Camel Case in Java

Learn how to convert a string name into Camel Case in Java using substring() and toUpperCase() methods. Camel Case is a naming convention where the first letter of each word is capitalized.

Code Explanation (Step-by-Step)

  • First, we create a method named getCamelCaseName() that accepts two input parameters: firstName and lastName.
  • Inside the if condition, we check whether firstName and lastName are not null and empty.
  • The expression lastName.substring(0, 1).toUpperCase() extracts the first character of lastName and converts it to uppercase.
  • The expression lastName.substring(1) retrieves the remaining characters of lastName.
  • Both parts are combined to create the last name in Camel Case format.
  • Similarly, firstName.substring(0, 1).toUpperCase() extracts the first character of firstName and converts it to uppercase.
  • The expression firstName.substring(1) retrieves the remaining characters of firstName.
  • Both parts are combined to create the first name in Camel Case format.
  • Finally, lastName and firstName are concatenated with a comma and a space separator to form the full name in Camel Case.
  • Now the method returns the formatted full name to print.
				
					public class CamelCaseName {

    private static String getCamelCaseName(String firstName, String lastName) {

        if (firstName == null || lastName == null
                || firstName.isEmpty() || lastName.isEmpty()) {
            return "";
        }

        firstName = firstName.substring(0, 1).toUpperCase()
                + firstName.substring(1);

        lastName = lastName.substring(0, 1).toUpperCase()
                + lastName.substring(1);

        return lastName + ", " + firstName;
    }

    public static void main(String[] args) {

        System.out.println("Full Name is :- "
                + getCamelCaseName("ajay", "kumar"));
    }
}

Output :-
Full Name is :- Kumar, Ajay

What Is Camel Case in Java?

Camel Case is a naming convention where the first letter of each word is capitalized.it is a naming convention in Java where multiple words are joined together without spaces.The capital letters resemble the humps of a camel, which is why it is called Camel Case.
Example :
firstName
lastName
studentAge
calculateTotal
employeeDetails

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