diff --git a/w3/BankAccount.java b/w3/BankAccount.java
new file mode 100644
index 0000000..e194c99
--- /dev/null
+++ b/w3/BankAccount.java
@@ -0,0 +1,46 @@
+public class BankAccount {
+    private String accountNumber ;
+    private double balance ;
+    public String ownerName ;
+
+    public BankAccount (String accountNumber , String ownerName) {
+        this.accountName = accountName ;
+        this.ownerName = ownerName ;
+        this.balance = 0.0 ; 
+    } 
+   
+    public void ck(double money) {
+        if (money > 0) {
+            balance += money
+            System.out.println("存款成功，当前余额："+balance);
+        }else{
+            System.out.println("存款失败，存款金额必须大于0");
+        }
+    }
+    public void qk(double money){
+        if (money <0){
+            System.out.println("取款失败，取款金额必须大于0");
+        }else if (money >balance){
+            System.out.println("取款失败，余额不足，当前余额："+balance);
+        }else () {
+            balance -= money
+            System.out.println("取款成功，当前余额："+balance);
+        }
+    }
+
+    public double getBalance() {return balance;
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+}
+        
\ No newline at end of file