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Mini Projects

Small, complete projects combine multiple concepts together — control flow, OOP, collections, and sometimes file handling — giving you practical, portfolio-worthy experience.

Why practice these?

Small, complete projects combine multiple concepts together — control flow, OOP, collections, and sometimes file handling — giving you practical, portfolio-worthy experience.

Mini Project Idea 1: Simple Student Management System (Console-Based)

A console application where a user can add a student's name and marks, store them in an ArrayList of Student objects, and display all records.

java
import java.util.*;

class Student {
    String name;
    int marks;

    Student(String name, int marks) {
        this.name = name;
        this.marks = marks;
    }
}

public class StudentManagementDemo {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<>();
        students.add(new Student("Aarav", 88));
        students.add(new Student("Divya", 92));

        for (Student s : students) {
            System.out.println(s.name + ": " + s.marks);
        }
    }
}

Output:

Aarav: 88
Divya: 92

Mini Project Idea 2: Simple Banking System (Console-Based)

A console application simulating deposit and withdrawal operations on a single account, using encapsulation to protect the balance field.

java
class BankAccount {
    private double balance = 0;

    void deposit(double amount) {
        balance += amount;
        System.out.println("Deposited: " + amount);
    }

    void withdraw(double amount) {
        if (amount <= balance) {
            balance -= amount;
            System.out.println("Withdrawn: " + amount);
        } else {
            System.out.println("Insufficient balance!");
        }
    }

    double getBalance() {
        return balance;
    }
}

public class BankingSystemDemo {
    public static void main(String[] args) {
        BankAccount account = new BankAccount();
        account.deposit(2000);
        account.withdraw(500);
        System.out.println("Final Balance: " + account.getBalance());
    }
}

Output:

Deposited: 2000.0
Withdrawn: 500.0
Final Balance: 1500.0

Key Points to Remember

  • Mini projects are a great way to combine OOP, collections, and control flow into one complete, working application.
  • Starting with console-based projects (before adding a GUI or database) keeps the learning focus on core logic.
  • Once comfortable, these mini projects can be extended further — adding file storage, JDBC persistence, or basic validation.