From 4facc4925fea6ccdf8f2b9334e150911d2ffa588 Mon Sep 17 00:00:00 2001
From: Lixinyi <3382734605@qq.com>
Date: Thu, 23 Apr 2026 14:49:49 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20''?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 BankAccount.class | Bin 0 -> 2442 bytes
 BankAccount.java  | 111 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 BankAccount.class
 create mode 100644 BankAccount.java

diff --git a/BankAccount.class b/BankAccount.class
new file mode 100644
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diff --git a/BankAccount.java b/BankAccount.java
new file mode 100644
index 0000000..63b52aa
--- /dev/null
+++ b/BankAccount.java
@@ -0,0 +1,111 @@
+/**
+ * 银行账户类，封装账户信息与操作行为
+ */
+public class BankAccount {
+    // 1. 定义私有属性，符合封装特性
+    private final String accountNumber; // 账户号：创建后不可修改，用final修饰
+    private String ownerName;           // 户主姓名：可修改
+    private double balance;             // 余额：仅通过存款/取款修改
+
+    /**
+     * 2. 构造方法：创建账户时必须传入账户号和户主姓名，初始余额为0
+     * @param accountNumber 账户号（不可修改）
+     * @param ownerName     户主姓名
+     */
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0; // 初始余额为0
+    }
+
+    /**
+     * 3. 存款操作
+     * @param amount 存款金额
+     */
+    public void deposit(double amount) {
+        // 校验：金额必须大于0
+        if (amount > 0) {
+            balance += amount;
+            System.out.println("存款成功！当前余额：" + String.format("%.2f", balance));
+        } else {
+            System.out.println("存款失败：金额必须大于0！");
+        }
+    }
+
+    /**
+     * 4. 取款操作
+     * @param amount 取款金额
+     */
+    public void withdraw(double amount) {
+        // 校验：金额大于0 且 不超过当前余额
+        if (amount > 0) {
+            if (amount <= balance) {
+                balance -= amount;
+                System.out.println("取款成功！当前余额：" + String.format("%.2f", balance));
+            } else {
+                System.out.println("取款失败：取款金额超过当前余额！");
+            }
+        } else {
+            System.out.println("取款失败：金额必须大于0！");
+        }
+    }
+
+    /**
+     * 5. 查询余额方法：对外提供查询，不允许直接修改
+     * @return 当前账户余额
+     */
+    public double getBalance() {
+        return balance;
+    }
+
+    /**
+     * 6. 获取账户号（仅提供getter，无setter，保证不可修改）
+     * @return 账户号
+     */
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    /**
+     * 7. 获取户主姓名
+     * @return 户主姓名
+     */
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    /**
+     * 8. 修改户主姓名（对外提供修改入口）
+     * @param ownerName 新的户主姓名
+     */
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    /**
+     * 测试类：验证账户功能
+     */
+    public static void main(String[] args) {
+        // 1. 创建账户（账户号：622202123456789，户主：张三）
+        BankAccount account = new BankAccount("622202123456789", "张三");
+
+        // 2. 测试存款
+        account.deposit(1000.0);  // 存款1000
+        account.deposit(-500.0);   // 存款负数（失败）
+
+        // 3. 测试取款
+        account.withdraw(300.0);  // 取款300
+        account.withdraw(800.0);   // 取款800（超过余额，失败）
+        account.withdraw(-100.0);  // 取款负数（失败）
+
+        // 4. 查询余额
+        System.out.println("最终查询余额：" + String.format("%.2f", account.getBalance()));
+
+        // 5. 修改户主姓名
+        account.setOwnerName("张小三");
+        System.out.println("修改后户主姓名：" + account.getOwnerName());
+
+        // 6. 尝试获取账户号（验证不可修改）
+        System.out.println("账户号：" + account.getAccountNumber());
+    }
+}
\ No newline at end of file