下面是一个简单的示例代码，涉及数字货币的基
    
                        时间：2025-12-11 17:20:06
                        
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            下面是一个简单的示例代码，涉及数字货币的基本实现，包括生成钱包地址、进行交易和查询余额等功能。这是一个高度简化的示例，实际的数字货币实现会更加复杂。

```java
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;

class Wallet {
    private String address;
    private double balance;

    public Wallet(String address) {
        this.address = address;
        this.balance = 0;
    }

    public String getAddress() {
        return address;
    }

    public double getBalance() {
        return balance;
    }

    public void addBalance(double amount) {
        balance  = amount;
    }

    public void deductBalance(double amount) {
        balance -= amount;
    }
}

class Transaction {
    private String sender;
    private String receiver;
    private double amount;

    public Transaction(String sender, String receiver, double amount) {
        this.sender = sender;
        this.receiver = receiver;
        this.amount = amount;
    }

    public String getSender() {
        return sender;
    }

    public String getReceiver() {
        return receiver;
    }

    public double getAmount() {
        return amount;
    }
}

class Blockchain {
    private MapString, Wallet wallets = new HashMap();
    private MapString, Transaction transactions = new HashMap();
    private int transactionIdCounter = 0;

    public void createWallet(String address) {
        wallets.put(address, new Wallet(address));
    }

    public void createTransaction(String sender, String receiver, double amount) {
        if (wallets.containsKey(sender) 
            
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