添加 'w3'

w3

@@ -0,0 +1,60 @@
+public class BankAccount {
+    // 1. 先定义私有属性
+    private final String accountNumber;
+    private String ownerName;
+    private double balance;
+
+    // 2. 构造方法
+    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
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.println("存款成功！当前余额：" + getBalance());
+        } else {
+            System.out.println("存款失败，金额必须大于0！");
+        }
+    }
+
+    // 4. 取款操作（补全完整逻辑）
+    public void withdraw(double amount) {
+        if (amount > 0 && amount <= balance) {
+            balance -= amount;
+            System.out.println("取款成功！当前余额：" + getBalance());
+        } else {
+            System.out.println("取款失败：金额无效或余额不足！");
+        }
+    }
+
+    // 5. 余额查询方法
+    public double getBalance() {
+        return balance;
+    }
+
+    // 6. 户主姓名修改方法
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+}
+
+// Main类，包含main方法用于测试
+class Main {
+    public static void main(String[] args) {
+        BankAccount account = new BankAccount("622202123456", "张三");
+        account.deposit(1000);
+        account.withdraw(300);
+    }
+}