数字货币的Java代码通常涉及多个方面，包括区块链开发、加密货币交易、钱包实现等。下面我将提供一个简单的框架示例，演示如何用Java实现一个基础的数字货币交易系统。请注意，这是一个非常简化的示例，不适用于生产环境，仅用于学习和理解数字货币的基本概念。 ```java import java.util.HashMap; import java.util.Map; import java.util.UUID; class Transaction { private String fromAddress; private String toAddress; private double amount; public Transaction(String fromAddress, String toAddress, double amount) { this.fromAddress = fromAddress; this.toAddress = toAddress; this.amount = amount; } // Getter methods public String getFromAddress() { return fromAddress; } public String getToAddress() { return toAddress; } public double getAmount() { return amount; } } class Wallet { private String address; private double balance; public Wallet() { this.address = UUID.randomUUID().toString(); this.balance = 0.0; } public void addFunds(double amount) { this.balance = amount; } public boolean sendFunds(double amount, Wallet recipient) { if (amount this.balance) { System.out.println(数字货币的Java代码通常涉及多个方面，包括区块链开发、加密货币交易、钱包实现等。下面我将提供一个简单的框架示例，演示如何用Java实现一个基础的数字货币交易系统。请注意，这是一个非常简化的示例，不适用于生产环境，仅用于学习和理解数字货币的基本概念。 ```java import java.util.HashMap; import java.util.Map; import java.util.UUID; class Transaction { private String fromAddress; private String toAddress; private double amount; public Transaction(String fromAddress, String toAddress, double amount) { this.fromAddress = fromAddress; this.toAddress = toAddress; this.amount = amount; } // Getter methods public String getFromAddress() { return fromAddress; } public String getToAddress() { return toAddress; } public double getAmount() { return amount; } } class Wallet { private String address; private double balance; public Wallet() { this.address = UUID.randomUUID().toString(); this.balance = 0.0; } public void addFunds(double amount) { this.balance = amount; } public boolean sendFunds(double amount, Wallet recipient) { if (amount this.balance) { System.out.println(