diff --git a/w3/BankAccount.java b/w3/BankAccount.java
new file mode 100644
index 0000000..9a2b231
--- /dev/null
+++ b/w3/BankAccount.java
@@ -0,0 +1,43 @@
+
+public class BankAccount {
+    private String accountNumber;
+    private String ownerName;
+    private double balance;
+    public BankAccount(String accountNumber, String ownerName, double balance){
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance=0.0;
+    }
+    public void deposit(double amount){
+        if (  amount >0.0){
+            this.balance+=amount;
+            System.out.printf("存款成功，余额为：%f\n",this.balance);
+        } else{
+            System.out.println("存款失败，金额必须大于0.0\n");
+        }
+    }
+    public void withdraw (double amount){
+        if (amount>0.0 &&amount<this.balance){
+            this.balance-=amount;
+            System.out.printf("取款成功，余额为：%f\n",this.balance);
+        } else{
+            System.out.println("取款失败，金额必须大于0.0且小于余额\n");
+        }
+        }
+        public double getbalance(){
+           return balance;
+        }
+        public String getAccountNumber(){
+           return accountNumber;
+        }
+        public String getOwnerName(){
+           return ownerName;
+        }
+        public void setAccountNumber(String accountNumber){
+           this.accountNumber = accountNumber;
+        }
+
+
+
+    }
+