diff --git a/w3/BankAccount.java b/w3/BankAccount.java
new file mode 100644
index 0000000..d583f71
--- /dev/null
+++ b/w3/BankAccount.java
@@ -0,0 +1,63 @@
+
+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;
+        System.out.println("户主姓名已更新为：" + ownerName);
+    }
+
+   
+    public double getBalance() {
+        return balance;
+    }
+
+   
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.println("存款成功！存入：" + amount + "，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！当前余额：" + balance);
+        } else {
+            balance -= amount;
+            System.out.println("取款成功！取出：" + amount + "，当前余额：" + balance);
+        }
+    }
+
+    
+    public void displayInfo() {
+        System.out.println("账户号：" + accountNumber);
+        System.out.println("户主姓名：" + ownerName);
+        System.out.println("当前余额：" + balance);
+    }
+}
\ No newline at end of file