Method declaration in Java - Mini Project: Build & Apply

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Method declaration

📖 Scenario: You are creating a simple Java program to greet users by name. This program will help you understand how to declare and use methods in Java.

🎯 Goal: Build a Java program that declares a method called greetUser which takes a String parameter called name and prints a greeting message including that name.

📋 What You'll Learn

Declare a method named greetUser that takes one String parameter called name

The method should print the message: Hello, <name>! where <name> is the parameter value

Call the greetUser method from the main method with the argument "Alice"

Print the greeting message to the console

💡 Why This Matters

🌍 Real World

Methods are used in all Java programs to organize code into small, reusable pieces that perform specific tasks.

💼 Career

Understanding method declaration is essential for any Java developer, as it is the foundation for writing clean, maintainable, and reusable code.

1

Create the main class and main method

Create a public class named Greeting and inside it, write the main method with the exact signature public static void main(String[] args).

Java

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

💡 Need a hint?

The main method is the entry point of a Java program. Use the exact signature public static void main(String[] args).

2

Declare the greetUser method

Inside the Greeting class but outside the main method, declare a public static method named greetUser that takes a String parameter called name and returns nothing (void).

Java

public class Greeting {
    public static void main(String[] args) {
        
    }

    // Your code here
}

💡 Need a hint?

Method declaration syntax: public static void greetUser(String name) means the method is public, static, returns nothing, and takes one String parameter.

3

Add print statement inside greetUser method

Inside the greetUser method, write a System.out.println statement that prints the message Hello, <name>! using the parameter name with string concatenation.

Java

public class Greeting {
    public static void main(String[] args) {
        
    }

    public static void greetUser(String name) {
        // Your code here
    }
}

💡 Need a hint?

Use System.out.println("Hello, " + name + "!") to print the greeting message.

4

Call greetUser method from main

Inside the main method, call the greetUser method with the argument "Alice" to display the greeting message.

Java

public class Greeting {
    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 writing greetUser("Alice"); inside the main method.