diff --git a/W3/BankAccount.java b/W3/BankAccount.java
new file mode 100644
index 0000000..984d5de
--- /dev/null
+++ b/W3/BankAccount.java
@@ -0,0 +1,64 @@
+package w3;
+
+public class BankAccount {
+    // 1. 私有属性（封装）
+    private final String accountNumber; // 账户号（final 修饰，创建后不可修改）
+    private String ownerName;           // 户主姓名（可修改）
+    private double balance;             // 余额（只能通过存取款修改）
+
+    // 2. 构造方法（创建账户必须提供账户号和户主姓名，初始余额为0）
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0; // 初始余额为0
+    }
+
+    // 3. Getter 方法（对外提供查询）
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    // 4. Setter 方法（仅允许修改户主姓名）
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+
+    // 5. 存款操作（金额必须>0）
+    public void deposit(double amount) {
+        if (amount > 0) {
+            this.balance += amount;
+            System.out.println("存款成功！当前余额：" + this.balance);
+        } else {
+            System.out.println("存款失败：存款金额必须大于0！");
+        }
+    }
+
+    // 6. 取款操作（金额必须>0且不超过当前余额）
+    public void withdraw(double amount) {
+        if (amount > 0 && amount <= this.balance) {
+            this.balance -= amount;
+            System.out.println("取款成功！当前余额：" + this.balance);
+        } else if (amount <= 0) {
+            System.out.println("取款失败：取款金额必须大于0！");
+        } else {
+            System.out.println("取款失败：余额不足！");
+        }
+    }
+
+    // 7. 打印账户信息（方便测试）
+    public void printAccountInfo() {
+        System.out.println("===== 账户信息 =====");
+        System.out.println("账户号：" + accountNumber);
+        System.out.println("户主姓名：" + ownerName);
+        System.out.println("当前余额：" + balance);
+        System.out.println("====================");
+    }
+}
\ No newline at end of file
diff --git a/W3/BankAccountTest.java b/W3/BankAccountTest.java
new file mode 100644
index 0000000..754dad0
--- /dev/null
+++ b/W3/BankAccountTest.java
@@ -0,0 +1,30 @@
+package w3;
+
+public class BankAccountTest {
+    public static void main(String[] args) {
+        // 1. 创建一个银行账户
+        BankAccount account = new BankAccount("622202123456789", "客户A");
+
+        // 2. 打印初始信息
+        account.printAccountInfo();
+
+        // 3. 测试存款
+        account.deposit(1000);
+        account.printAccountInfo();
+
+        // 4. 测试取款
+        account.withdraw(300);
+        account.printAccountInfo();
+
+        // 5. 测试修改户主姓名
+        account.setOwnerName("客户A-新版");
+        System.out.println("修改后户主姓名：" + account.getOwnerName());
+
+        // 6. 测试异常情况（取款金额>余额）
+        account.withdraw(800);
+        // 测试异常情况（存款金额<=0）
+        account.deposit(-500);
+        // 测试异常情况（取款金额<=0）
+        account.withdraw(-100);
+    }
+}
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diff --git a/W3/BankAccount运行截图.png b/W3/BankAccount运行截图.png
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diff --git a/W3/Employee.java b/W3/Employee.java
new file mode 100644
index 0000000..a8bb844
--- /dev/null
+++ b/W3/Employee.java
@@ -0,0 +1,85 @@
+package w3;
+
+public class Employee {
+    private static String companyName;
+    private String id;
+    private String name;
+    private String department;
+    private double salary;
+    private static final double MIN_SALARY = 2000;
+
+    static {
+        // 这里改成通用公司名，无任何个人信息
+        companyName = "科技有限公司";
+    }
+
+    public Employee(String id, String name, String department, double salary) {
+        this.id = id;
+        this.name = name;
+        this.department = department;
+        setSalary(salary);
+    }
+
+    public static String getCompanyName() {
+        return companyName;
+    }
+
+    public static void setCompanyName(String companyName) {
+        Employee.companyName = companyName;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDepartment() {
+        return department;
+    }
+
+    public void setDepartment(String department) {
+        this.department = department;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        if (salary >= MIN_SALARY) {
+            this.salary = salary;
+        } else {
+            System.out.println("工资不能低于最低工资标准 " + MIN_SALARY);
+            this.salary = MIN_SALARY;
+        }
+    }
+
+    public void raiseSalary(double percent) {
+        double newSalary = this.salary * (1 + percent / 100);
+        if (newSalary >= MIN_SALARY) {
+            this.salary = newSalary;
+        } else {
+            this.salary = MIN_SALARY;
+        }
+    }
+
+    public void printInfo() {
+        System.out.println("公司：" + companyName);
+        System.out.println("工号：" + id);
+        System.out.println("姓名：" + name);
+        System.out.println("部门：" + department);
+        System.out.println("工资：" + String.format("%.2f", salary));
+        System.out.println("------------------------");
+    }
+}
\ No newline at end of file
diff --git a/W3/EmployeeTest.java b/W3/EmployeeTest.java
new file mode 100644
index 0000000..fb91f43
--- /dev/null
+++ b/W3/EmployeeTest.java
@@ -0,0 +1,26 @@
+package w3;
+
+public class EmployeeTest {
+    public static void main(String[] args) {
+        // 创建两个员工对象（通用信息）
+        Employee emp1 = new Employee("1001", "员工A", "开发部", 5000);
+        Employee emp2 = new Employee("1002", "员工B", "测试部", 2800);
+
+        // 打印初始信息
+        System.out.println("===== 第一个员工信息 =====");
+        emp1.printInfo();
+
+        System.out.println("===== 第二个员工信息 =====");
+        emp2.printInfo();
+
+        // 涨薪操作
+        emp1.raiseSalary(10);
+        System.out.println("===== 涨薪10%后员工1信息 =====");
+        emp1.printInfo();
+
+        // 修改部门
+        emp2.setDepartment("产品部");
+        System.out.println("===== 修改部门后员工2信息 =====");
+        emp2.printInfo();
+    }
+}
\ No newline at end of file
diff --git a/W3/Employee运行截图.png b/W3/Employee运行截图.png
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