From 4b25f19b0ff43eed0aa9e42cdea19d4a1d0e9e4d Mon Sep 17 00:00:00 2001
From: Lanyutong <228508663@qq.com>
Date: Mon, 23 Mar 2026 20:00:08 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E5=AE=8C=E6=88=90W3=20BankAccount.java?=
 =?UTF-8?q?=E6=A0=87=E5=87=86=E6=BA=90=E6=96=87=E4=BB=B6=E6=8F=90=E4=BA=A4?=
MIME-Version: 1.0
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---
 W3/BankAccount.java.txt | 50 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/W3/BankAccount.java.txt b/W3/BankAccount.java.txt
index e69de29..e830a47 100644
--- a/W3/BankAccount.java.txt
+++ b/W3/BankAccount.java.txt
@@ -0,0 +1,50 @@
+public class BankAccount {
+    // private 成员变量（封装：私有化属性）
+    private String accountNumber;
+    private String ownerName;
+    private double balance;
+
+    // 构造方法：初始化账户
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0;
+    }
+
+    // getter 和 setter 方法（封装：提供公共访问接口）
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    // 业务方法：存款
+    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("存款金额必须大于0");
+        }
+    }
+
+    // 业务方法：取款
+    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("余额不足或金额无效");
+        }
+    }
+}
\ No newline at end of file