diff --git a/W3/BankAccount.java b/W3/BankAccount.java
new file mode 100644
index 0000000..30aa261
--- /dev/null
+++ b/W3/BankAccount.java
@@ -0,0 +1,43 @@
+public 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 String getAccountNumber() {
+        return accountNumber;
+    }
+    public String getOwnerName() {
+        return ownerName;
+    }
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+    public double getBalance() {
+        return balance;
+    }
+    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("存款失败！金额必须大于0");
+        }
+    }
+    public void withdraw(double amount) {
+        if (amount <= 0) {
+            System.out.println("取款失败！金额必须大于0");
+        } else if (amount > balance) {
+            System.out.println("取款失败！余额不足");
+        } else {
+            balance -= amount;
+            System.out.println("取款成功！当前余额：" + balance);
+        }
+    }
+    public void showAccountInfo() {
+        System.out.println("账户号：" + accountNumber + "，户主：" + ownerName + "，余额：" + balance);
+    }
+}
\ No newline at end of file
diff --git a/W3/BankAccountTest.java b/W3/BankAccountTest.java
new file mode 100644
index 0000000..af17668
--- /dev/null
+++ b/W3/BankAccountTest.java
@@ -0,0 +1,10 @@
+public class BankAccountTest {
+    public static void main(String[] args) {
+        BankAccount account = new BankAccount("622848123456789", "张三");
+        account.showAccountInfo();
+        account.deposit(1000);
+        account.withdraw(300);
+        account.setOwnerName("李四");
+        account.showAccountInfo();
+    }
+}
\ No newline at end of file
diff --git a/W3/运行截图.png b/W3/运行截图.png
new file mode 100644
index 0000000..e7fdd01
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