Method parameters in Java - Mini Project: Build & Apply

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Method parameters

📖 Scenario: You are creating a simple calculator program that can add two numbers. You will learn how to use method parameters to pass values into a method.

🎯 Goal: Build a Java program with a method called add that takes two numbers as parameters and returns their sum. Then, call this method and print the result.

📋 What You'll Learn

Create a method named add with two int parameters named a and b

The add method should return the sum of a and b

Call the add method with the numbers 5 and 7

Print the result of the add method call

💡 Why This Matters

🌍 Real World

Methods with parameters are used everywhere in programming to perform tasks with different inputs, like calculators, games, and apps.

💼 Career

Understanding method parameters is essential for writing reusable and organized code, a key skill for any software developer.

1

Create the main class and main method

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

Java

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

💡 Need a hint?

Start by typing public class Calculator { and then add the main method inside.

2

Create the add method with parameters

Inside the Calculator class but outside the main method, create a public static method named add that takes two int parameters called a and b and returns their sum as an int.

Java

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

💡 Need a hint?

Define the method with public static int add(int a, int b) and return the sum using return a + b;.

3

Call the add method in main

Inside the main method, call the add method with the numbers 5 and 7 and store the result in an int variable named result.

Java

public class Calculator {
    public static void main(String[] args) {
        // Your code here
    }
    public static int add(int a, int b) {
        return a + b;
    }
}

💡 Need a hint?

Use int result = add(5, 7); inside the main method to call the add method.

4

Print the result

Add a line inside the main method to print the value of the result variable using System.out.println.

Java

public class Calculator {
    public static void main(String[] args) {
        int result = add(5, 7);
        // Your code here
    }
    public static int add(int a, int b) {
        return a + b;
    }
}

💡 Need a hint?

Print the result using System.out.println(result);.