java/w3/BackAccount.java

package w3;


public class BackAccount {
    // 内部类，不需要 public
    static class BankAccount {
        private final String accountNumber;
        private String ownerName;
        private double balance;

        public BankAccount(String accountNumber, String ownerName) {
            this.accountNumber = accountNumber;
            this.ownerName = ownerName;
            this.balance = 0;
        }

        public void deposit(double amount) {
            if (amount > 0) {
                balance += amount;
                System.out.println("存款成功！当前余额：" + balance);
            } else {
                System.out.println("存款失败：金额必须大于0！");
            }
        }

        public void withdraw(double amount) {
            if (amount > 0 && amount <= balance) {
                balance -= amount;
                System.out.println("取款成功！当前余额：" + balance);
            } else {
                System.out.println("取款失败：金额无效或余额不足！");
            }
        }

        public double getBalance() {
            return balance;
        }

        public void setOwnerName(String newName) {
            ownerName = newName;
            System.out.println("户主姓名已修改为：" + ownerName);
        }

        public String getAccountNumber() {
            return accountNumber;
        }

        public String getOwnerName() {
            return ownerName;
        }
    }

    public static void main(String[] args) {
        // 创建账户
        BankAccount account = new BankAccount("123456789", "张三");
        System.out.println("=== 创建银行账户 ===");
        System.out.println("账号：" + account.getAccountNumber());
        System.out.println("户主：" + account.getOwnerName());
        System.out.println("初始余额：" + account.getBalance());
        System.out.println();

        // 测试存款功能
        System.out.println("=== 存款测试 ===");
        account.deposit(1000);
        account.deposit(-200);
        account.deposit(500);
        System.out.println("当前余额：" + account.getBalance());
        System.out.println();

        // 测试取款功能
        System.out.println("=== 取款测试 ===");
        account.withdraw(300);
        account.withdraw(1500);
        account.withdraw(-100);
        System.out.println("当前余额：" + account.getBalance());
        System.out.println();

        // 测试修改户主姓名
        System.out.println("=== 修改户主信息 ===");
        account.setOwnerName("李四");
        System.out.println("当前户主：" + account.getOwnerName());
        System.out.println();

        // 最终账户信息
        System.out.println("=== 账户最终状态 ===");
        System.out.println("账号：" + account.getAccountNumber());
        System.out.println("户主：" + account.getOwnerName());
        System.out.println("余额：" + account.getBalance());
    }
}