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Object-Oriented Design with UML and Java public Mentor() { } // method: Mentor public int getSalary() { return Role.BASIC_SALARY + (int)(Role.BASIC_SALARY * MULTIPLIER); } // method: getSalary public String toString() { return Mentor ; } // method: toString […]

Chapter 8: Design Patterns public Employee(int aPayrollNumber) { thePayrollNumber = aPayrollNumber; theDelegate = null; } // method: Employee public void setDelegate(Role aRole) { the Delegate = aRole; } // method: setDelegate public int getPayrollNumber() { return thePayrollNumber; […]

Object-Oriented Design with UML and Java Staff list for The Object University: Employee with payroll number: 123 that is a Mentor Employee with payroll number: 456 that is a Guru The salary bill is: 230 8.2 Interface Although apparently rather simple, the interface […]

Chapter 8: Design Patterns public Programmer() { } // method: Programmer public int getSalary() { return BASIC_SALARY; } // method: getSalary public String toString() { return Programmer ; } // method: toString // —– Attributes ———protected static final int BASIC_SALARY […]

Object-Oriented Design with UML and Java totalBill += emp.getSalary(); } return totalBill; } // method: getSalaryBill public Employee getEmployee(int aPayrollNumber) { Iterator iter = theEmployees.iterator(); while(iter.hasNext()) { Employee emp = (Employee)iter.next(); if(aPayrollNumber == emp.getPayrollNumber()) return emp; […]

Chapter 8: Design Patterns co.hireEmployee(emp); // co.displayEmployees(); ConsoleIO.out.println( The salary bill is: + co.getSalaryBill()); ConsoleIO.out.println(); // emp = co.getEmployee(123); emp.setDelegate(new Mentor()); // emp = co.getEmployee(456); emp.setDelegate(new Guru()); // co.displayEmployees(); ConsoleIO.out.println( The salary bill is: + […]

Object-Oriented Design with UML and Java introducing the requirement that a programmer adopts other roles. For example, he might also be an administrator. In this case specialization is not appropriate. The reason is that we must change the class of a particular object, e.g. from Mentor to Programmer. A […]

Chapter 8: Design Patterns // —– Attributes ———- protected int thePayrollNumber; protected static final int BASIC_SALARY = 100; } // class: Programmer public class Mentor extends Programmer { // —– Operations ———public Mentor(int aPayrollNumber) { super(aPayrollNumber); } // method: Mentor […]

Object-Oriented Design with UML and Java Polymorphic substitution allows the Company to maintain a collection of Programmer, Mentor and Guru objects. To calculate the salary bill, the Company accumulates a total by iterating over the collection of Programmers requesting the salary of each object it encounters. Of course […]

Chapter 8: Design Patterns By way of contrast: delegation is implemented by object composition the delegate can be changed at run-time therefore delegation may be dynamic if required delegation uses public services therefore it respects encapsulation. To […]