Stack memory in Java - Mini Project: Build & Apply

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Understanding Stack Memory in Java

📖 Scenario: Imagine you are organizing a stack of books on a table. You can only add or remove the top book. This is similar to how stack memory works in Java, where data is stored and accessed in a last-in, first-out order.

🎯 Goal: You will create a simple Java program that uses local variables to demonstrate how stack memory stores values during method calls.

📋 What You'll Learn

Create a method with local variables

Call the method from main

Print the values of local variables

Understand how stack memory holds method data

💡 Why This Matters

🌍 Real World

Understanding stack memory helps programmers write efficient code and debug errors related to variable scope and method calls.

💼 Career

Knowledge of stack memory is essential for software developers, especially when working with method calls, recursion, and memory management.

1

Create the main method and a method called showStack

Write a Java class named StackDemo with a main method. Inside the class, create a method called showStack that takes no parameters and returns void.

Java

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

    // Define showStack method here
    // Your code here
}

💡 Need a hint?

Remember to define the class first, then add the main method and the showStack method inside the class.

2

Add local variables inside showStack

Inside the showStack method, create two local variables: an int named number with value 10, and a String named text with value "Stack Memory".

Java

public class StackDemo {
    public static void main(String[] args) {
        // Method call will be added later
    }

    public static void showStack() {
        int number = 10;
        String text = "Stack Memory";
        // Your code here
    }
}

💡 Need a hint?

Local variables are declared inside methods. Use int number = 10; and String text = "Stack Memory";.

3

Call showStack from main and print local variables

In the main method, call the showStack method. Then, inside showStack, add two System.out.println statements to print the values of number and text.

Java

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

    public static void showStack() {
        int number = 10;
        String text = "Stack Memory";
        System.out.println(number);
        System.out.println(text);
        // Your code here
    }
}

💡 Need a hint?

Call showStack(); inside main. Use System.out.println(number); and System.out.println(text); inside showStack.

4

Run the program and observe the output

Run the program. It should print the values of number and text on separate lines.

Java

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

    public static void showStack() {
        int number = 10;
        String text = "Stack Memory";
        System.out.println(number);
        System.out.println(text);
    }
}

💡 Need a hint?

The program prints the local variables stored in stack memory. You should see 10 and Stack Memory on separate lines.