Java/com/study/demo13/PaymentService.java

package com.study.demo13;

interface Payable {
    boolean pay(double amount);
    String getPayType();
}

abstract class Account implements Payable {
    protected double balance;

    public Account(double balance) {
        this.balance = balance;
    }

    protected boolean canPay(double total) {
        return balance >= total;
    }

    public double getBalance() {
        return balance;
    }
}

class BankAccount extends Account {
    public BankAccount(double balance) {
        super(balance);
    }

    @Override
    public boolean pay(double amount) {
        if (canPay(amount)) {
            balance -= amount;
            return true;
        }
        return false;
    }

    @Override
    public String getPayType() {
        return "BANK";
    }
}

class WalletAccount extends Account {
    public WalletAccount(double balance) {
        super(balance);
    }

    @Override
    public boolean pay(double amount) {
        double total = amount * 1.05;
        if (canPay(total)) {
            balance -= total;
            return true;
        }
        return false;
    }

    @Override
    public String getPayType() {
        return "WALLET";
    }
}

public class PaymentService {
    public static void main(String[] args) {
        Payable bank = new BankAccount(1000.0);
        Payable wallet = new WalletAccount(500.0);
        Payable bank2 = new BankAccount(100.0);
        Payable wallet2 = new WalletAccount(50.0);

        System.out.println("支付方式: " + bank.getPayType() + ", 支付 200: " + (bank.pay(200) ? "成功" : "失败") + ", 余额: " + ((BankAccount) bank).getBalance());
        System.out.println("支付方式: " + wallet.getPayType() + ", 支付 100: " + (wallet.pay(100) ? "成功" : "失败") + ", 余额: " + String.format("%.2f", ((WalletAccount) wallet).getBalance()));
        System.out.println("支付方式: " + bank.getPayType() + ", 支付 200: " + (bank2.pay(200) ? "成功" : "失败") + ", 余额: " + ((BankAccount) bank2).getBalance());
        System.out.println("支付方式: " + wallet.getPayType() + ", 支付 100: " + (wallet2.pay(100) ? "成功" : "失败") + ", 余额: " + String.format("%.2f", ((WalletAccount) wallet2).getBalance()));
    }
}