上传文件至 'W3'

W3/BankAccount.java

@@ -0,0 +1,38 @@
+
+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 = 0.0;
+    }
+
+    public void deposit(double amount) {
+        if (amount > 0) {
+            this.balance += amount;
+            System.out.println("[业务] 存入 $" + amount + " 成功。");
+        } else {
+            System.out.println("[业务] 存款失败：金额必须大于0。");
+        }
+    }
+
+    public void withdraw(double amount) {
+        if (amount > 0 && amount <= this.balance) {
+            this.balance -= amount;
+            System.out.println("[业务] 取出 $" + amount + " 成功。");
+        } else {
+            System.out.println("[业务] 取款失败：余额不足或金额无效。");
+        }
+    }
+
+    public double getBalance() {
+        return this.balance;
+    }
+
+    public String getOwnerName() {
+        return this.ownerName;
+    }
+}

W3/BankAccountDemo.java

@@ -0,0 +1,26 @@
+public class BankAccountDemo {
+    public static void main(String[] args) {
+        System.out.println("====== 开始运行测试程序 ======\n");
+
+        BankAccount myAccount = new BankAccount("CN-888", "王五");
+        myAccount.deposit(5000.0);
+        myAccount.deposit(2000.0);
+
+        System.out.println("当前户主: " + myAccount.getOwnerName());
+        System.out.println("当前余额: $" + myAccount.getBalance());
+
+        myAccount.withdraw(1000.0);
+        myAccount.withdraw(100000.0);
+        myAccount.withdraw(-500.0);
+
+        System.out.println("最终余额: $" + myAccount.getBalance());
+
+        BankAccount friendAccount = new BankAccount("CN-999", "赵六");
+        friendAccount.deposit(100.0);
+
+        System.out.println("王五的余额: $" + myAccount.getBalance());
+        System.out.println("赵六的余额: $" + friendAccount.getBalance());
+
+        System.out.println("\n====== 测试程序结束 ======");
+    }
+}