Common string methods in Java - Mini Project: Build & Apply

folder_code

Common string methods

📖 Scenario: You are working on a simple Java program that processes a user's full name to extract useful information.

🎯 Goal: Build a Java program that uses common string methods to analyze and manipulate a full name.

📋 What You'll Learn

Create a String variable with a full name

Create an int variable to store the length of the name

Use string methods to find the first name and last name

Print the length, first name, and last name

💡 Why This Matters

🌍 Real World

Processing user names is common in apps that register users or display profiles.

💼 Career

Knowing string methods helps in data cleaning, user input validation, and text processing tasks.

1

Create the full name variable

Create a String variable called fullName and set it to the exact value "John Doe".

Java

# Create a String variable called fullName and set it to "John Doe"
// Your code here

💡 Need a hint?

Use String fullName = "John Doe"; to create the variable.

2

Find the length of the full name

Add an int variable called nameLength that stores the length of fullName using the length() method.

Java

public class Main {
    public static void main(String[] args) {
        String fullName = "John Doe";
        // Create int variable nameLength to store fullName.length()
        // Your code here
    }
}

💡 Need a hint?

Use int nameLength = fullName.length(); to get the length.

3

Extract the first and last names

Create two String variables: firstName and lastName. Use indexOf(' '), substring() methods on fullName to get the first and last names.

Java

public class Main {
    public static void main(String[] args) {
        String fullName = "John Doe";
        int nameLength = fullName.length();
        // Create firstName and lastName using substring and indexOf
        // Your code here
    }
}

💡 Need a hint?

Use indexOf(' ') to find the space, then substring() to get parts.

4

Print the results

Use System.out.println to print nameLength, firstName, and lastName each on its own line.

Java

public class Main {
    public static void main(String[] args) {
        String fullName = "John Doe";
        int nameLength = fullName.length();
        int spaceIndex = fullName.indexOf(' ');
        String firstName = fullName.substring(0, spaceIndex);
        String lastName = fullName.substring(spaceIndex + 1);
        // Print nameLength, firstName, and lastName each on a new line
        // Your code here
    }
}

💡 Need a hint?

Use System.out.println(variable); to print each value.