Stack in a Simple Way Example in Java

Introduction

Stack In A Simple Way is a classic Java console program that demonstrates the concept with complete source code and sample output. Classic data structures such as stack, queue and linked list implemented in Java.

This tutorial walks through the program line by line, explains how the logic works, and highlights best practices you can apply in your own code.

Definition

A stack is a basic computer science data structure and can be defined in an abstract, implementation-free manner, or it can be generally defined as a linear list of items in which all additions and deletion are restricted to one end that is Top.

Stack In A Simple Way Example Program

import java.util.Stack;

public class SimpleStack {

    public static void main(String[] args) {
        Stack stack = new Stack();

        System.out.println("Stack Items \n" + stack);
        System.out.println("Stack Size :" + stack.size());

        System.out.println("Stack Push \n");
        stack.push("A");
        stack.push(new Integer(20));
        stack.push("Example");

        System.out.println("Stack Items \n" + stack);
        System.out.println("Stack Size :" + stack.size());

        System.out.println("Stack Pop \n");
        System.out.println("Pop Data :" + stack.pop());
        System.out.println("Pop Data " + stack.pop());
        System.out.println("Pop Data " + stack.pop());

        System.out.println("Stack Items \n" + stack);
        System.out.println("Stack Size :" + stack.size());
    }
}

Sample Output

Stack Items 
[]
Stack Size :0
Stack Push 

Stack Items 
[A, 20, Example]
Stack Size :3
Stack Pop 

Pop Data :Example
Pop Data 20
Pop Data A
Stack Items 
[]
Stack Size :0

When to use

Use this stack in a simple way example when learning or revising core Java syntax.

How it works

1. Execution begins in the main method — the JVM calls this method when you run the class.

2. import java.util.Stack; imports a class used later in the program.

3. Stack stack = new Stack(); updates a variable used in the calculation or output.

4. A println / print call writes text to the console — part of the sample output below.

5. A println / print call writes text to the console — part of the sample output below.

6. A println / print call writes text to the console — part of the sample output below.

7. A println / print call writes text to the console — part of the sample output below.

8. A println / print call writes text to the console — part of the sample output below.

Best Practices

• Use meaningful variable and class names that describe their purpose.
• Compile and run the program locally — modify values to see how output changes.
• Read compiler errors carefully; they usually point to the exact line to fix.

Common Mistakes

• Copying code without understanding each line — practice by changing one statement at a time.
• Mismatching the public class name and the .java filename.
• Forgetting semicolons at the end of statements.