薪水支付案例（3）

删除雇员

下面给出删除雇员操作的静态和动态模型，删除雇员也是采用典型的COMMAND模式实现

删除雇员静态图：

删除雇员时序图：

下面给出部分代码，也是从测试代码开始：

DeleteEmployeeTransactionTest

package salary;import implement.database.PayrollDatabase;import implement.entity.Employee;import implement.transaction.AddSalariedEmployee;import implement.transaction.DeleteEmployeeTransaction;import junit.framework.TestCase;import org.junit.Test;import static org.junit.Assert.assertNull;/** * 删除雇员 * Created by ZD on 2017/10/24. */public class DeleteEmployeeTransactionTest {    PayrollDatabase payrollDatabase = PayrollDatabase.getPayrollDatabase();    @Test    public void testDeleteEmployee(){        long id = 4;        String name = "Bob4";        String address = "Bob4.home";        double monthlyPay = 1000;        AddSalariedEmployee addSalariedEmployee = new AddSalariedEmployee(id,name,address,monthlyPay);        addSalariedEmployee.execute();        Employee e = payrollDatabase.getEmployeeById(id);        //assertEquals(e,addSalariedEmployee);        DeleteEmployeeTransaction deleteEmployeeTransaction = new DeleteEmployeeTransaction(id);        deleteEmployeeTransaction.execute();        assertNull(payrollDatabase.getEmployeeById(id));    }}

DeleteEmployeeTransaction

package implement.transaction;import implement.database.PayrollDatabase;/** * Created by ZD on 2017/10/24. */public class DeleteEmployeeTransaction implements Transaction {    private long id;    public DeleteEmployeeTransaction(){}    public DeleteEmployeeTransaction(long id){        this.id = id;    }    public void execute() {        PayrollDatabase.getPayrollDatabase().deleteEmployeeById(id);    }}