Method calling in Java - Mini Project: Build & Apply

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Method calling

📖 Scenario: You are creating a simple Java program to greet users by their names. This program will help you understand how to call methods to reuse code.

🎯 Goal: Build a Java program that defines a method to greet a user by name and calls this method to display a greeting message.

📋 What You'll Learn

Create a method named greetUser that takes a String parameter called name and prints a greeting message.

Call the greetUser method from the main method with a specific name.

Print the greeting message to the console.

💡 Why This Matters

🌍 Real World

Calling methods is how programs reuse code to perform tasks multiple times without repeating code.

💼 Career

Understanding method calling is essential for writing clean, organized, and maintainable Java programs in any software development job.

1

Create the main class and main method

Create a public class named GreetingApp and add the main method inside it.

Java

public class GreetingApp {
    public static void main(String[] args) {
        // Your code here
    }
}

💡 Need a hint?

The main method is the starting point of any Java program.

2

Create the greetUser method

Inside the GreetingApp class but outside the main method, create a public static method named greetUser that takes a String parameter called name and prints "Hello, " + name + "!".

Java

public class GreetingApp {
    public static void main(String[] args) {
        
    }
    // Your code here
}

💡 Need a hint?

Define the method outside main but inside the class. Use System.out.println to print.

3

Call the greetUser method from main

Inside the main method, call the greetUser method with the argument "Alice".

Java

public class GreetingApp {
    public static void main(String[] args) {
        // Your code here
    }
    public static void greetUser(String name) {
        System.out.println("Hello, " + name + "!");
    }
}

💡 Need a hint?

Call the method by its name and pass the exact string "Alice" as argument.

4

Print the greeting message

Run the program and print the output to the console. The output should be exactly Hello, Alice!

Java

public class GreetingApp {
    public static void main(String[] args) {
        greetUser("Alice");
        // Your code here
    }
    public static void greetUser(String name) {
        System.out.println("Hello, " + name + "!");
    }
}

💡 Need a hint?

Make sure to run the program and check the console output.