


Introduction to Java Basics to Practical Applications: Object-Oriented Practical Design
Object-oriented programming (OOP) is a programming paradigm that introduces objects and classes into code to facilitate the development of large software systems. This article introduces the practical application of object-oriented design through a bank account system case: Define classes and objects: Divide system functions into classes and objects, for example, the BankAccount class represents a bank account. Create and use objects: Create a BankAccount object and operate it using methods such as deposit, withdrawal, and balance query. Modularity and maintainability: By separating data and operations into classes and objects, the scalability, reusability and ease of maintenance of the code are achieved.
Java Basics to Practical Application: Object-Oriented Practical Design
Object-oriented programming (OOP) is a programming paradigm. It introduces the concepts of objects and classes into code, making it easier to develop and maintain large software systems. This article will provide a practical case to help you understand the basics of object-oriented design.
Case: Design a bank account system
Consider a bank account system that contains the following main functions:
- Create an account
- Deposit
- Withdrawal
- Check balance
Design classes and objects
The first step is to define Classes and objects in the system. A bank account can be represented as a class, which contains account information and operation methods.
public class BankAccount { private int accountNumber; private double balance; // Constructor public BankAccount(int accountNumber, double balance) { this.accountNumber = accountNumber; this.balance = balance; } // Methods public void deposit(double amount) { balance += amount; } public void withdraw(double amount) { if (amount <= balance) { balance -= amount; } } public double getBalance() { return balance; } }
Creating and using objects
Next, we can create BankAccount
objects and perform operations with them.
// 创建一个账户对象 BankAccount account = new BankAccount(123456789, 1000.0); // 存入 500 元 account.deposit(500.0); // 取款 300 元 account.withdraw(300.0); // 查询余额 double balance = account.getBalance(); System.out.println("账户余额:" + balance);
Output results:
账户余额:1200.0
By using classes and objects to separate data and operations in the code, we create a modular and easy-to-maintain bank account system.
Conclusion
Object-oriented design is a powerful method for building complex systems in Java. By understanding the concepts of classes, objects, and methods, you can design code that is extensible, reusable, and easy to understand.
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