Here are ten Java projects that can enhance your coding abilities:

1. Simple Calculator: Build a basic calculator application that performs arithmetic operations like addition, subtraction, multiplication, and division. This project will help you understand user input, basic operations, and handling exceptions.

1. Todo List Application: Develop a todo list application where users can add, update, delete, and mark tasks as complete. This project will introduce you to concepts like data storage, CRUD operations, and user interfaces using JavaFX or Swing.

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1. Banking System: Create a simple banking system that allows users to create accounts, deposit/withdraw money, and check their balance. This project will deepen your understanding of object-oriented programming (OOP) principles, encapsulation, and inheritance.

1. File Encryption/Decryption: Implement a program to encrypt and decrypt text files using algorithms like Caesar cipher or AES encryption. This project will enhance your knowledge of cryptography, file I/O operations, and algorithm implementation.

1. Weather Forecast App: Build an application that fetches weather data from an API and displays it to users. This project will introduce you to working with APIs, parsing JSON/XML data, and handling network requests.

1. Online Quiz Game: Develop a quiz game where users can answer multiple-choice questions on various topics. This project will help you understand concepts like randomization, scoring, and user input validation.

1. Chat Application: Create a simple chat application using sockets for communication between clients and a server. This project will improve your understanding of networking concepts, multithreading, and event-driven programming.
2. Expense Tracker: Build an expense tracking application that allows users to log their expenses, categorize them, and generate reports. This project will reinforce your skills in data management, filtering, and generating meaningful insights from data.

1. Inventory Management System: Develop a system for managing inventory items, including functionalities like adding/removing items, updating quantities, and generating reports. This project will deepen your understanding of data structures, database management, and user interfaces.

1. Personal Finance Manager: Create a comprehensive personal finance manager that tracks income, expenses, budgets, and savings goals. This project will integrate various concepts you've learned, including GUI development, data analysis, and financial calculations.

1. These projects cover a wide range of topics and difficulty levels, providing ample opportunities to apply and expand your Java coding skills. As you work on them, focus not only on completing the tasks but also on writing clean, efficient, and maintainable code.