编写测试主类testclass创建employee，manager类的对象

好的，让我为您编写测试主类testclass来创建employee和manager类的对象。以下是示例代码：

public class TestClass {
   public static void main(String[] args) {
      // 创建Employee对象
      Employee employee = new Employee("John", 50000);
      employee.display();

      // 创建Manager对象
      Manager manager = new Manager("David", 80000, "IT department");
      manager.display();
   }
}

// Employee类
class Employee {
   private String name;
   private double salary;

   public Employee(String name, double salary) {
      this.name = name;
      this.salary = salary;
   }

   public void display() {
      System.out.println("Employee name: " + name);
      System.out.println("Employee salary: " + salary);
   }
}

// Manager类继承Employee类
class Manager extends Employee {
   private String department;

   public Manager(String name, double salary, String department) {
      super(name, salary);
      this.department = department;
   }

   public void display() {
      super.display();
      System.out.println("Manager department: " + department);
   }
}

请注意，这只是示例代码，您可以根据需要进行更改。