银行账户类

W3/BankAccount/BankAccount.java

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+public class BankAccount {
+    // 私有属性
+    private final String accountNumber;
+    private String ownerName;
+    private double balance;
+
+    // 构造方法
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0;
+    }
+
+    // 账户号 getter（无 setter）
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    // 户主姓名 getter 和 setter
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    // 余额 getter（无直接 setter）
+    public double getBalance() {
+        return balance;
+    }
+
+    // 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：" + balance + " 元");
+        } else {
+            System.out.println("存款失败！存款金额必须大于0");
+        }
+    }
+
+    // 取款操作
+    public void withdraw(double amount) {
+        if (amount <= 0) {
+            System.out.println("取款失败！取款金额必须大于0");
+        } else if (amount > balance) {
+            System.out.println("取款失败！余额不足，当前余额：" + balance + " 元");
+        } else {
+            balance -= amount;
+            System.out.println("取款成功！当前余额：" + balance + " 元");
+        }
+    }
+}

W3/BankAccount/BankAccountTest.java

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+public class BankAccountTest {
+    // 程序入口：main 方法
+    public static void main(String[] args) {
+        // 1. 创建一个 BankAccount 对象（调用构造方法）
+        BankAccount account = new BankAccount("622202123456789", "张三");
+
+        // 2. 测试存款
+        account.deposit(1000);
+
+        // 3. 测试取款
+        account.withdraw(300);
+
+        // 4. 测试修改户主姓名
+        account.setOwnerName("张三丰");
+
+        // 5. 测试查询信息
+        System.out.println("账户号：" + account.getAccountNumber());
+        System.out.println("户主：" + account.getOwnerName());
+        System.out.println("余额：" + account.getBalance());
+    }
+}