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20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. public Address(String initType, String initStreet, String initCity, String initState, String initZip){ type = initType; street = initStreet; city = initCity; state = initState; zipCode = initZip; } public Address(String initStreet, String initCity, String initState, String initZip){ this(WORK, initStreet, initCity, initState, initZip); } public Address(String initType){ type = initType; } public Address(){ } public public public public public String String String String String public public public public public void void void void void getType(){ return type; } getStreet(){ return street; } getCity(){ return city; } getState(){ return state; } getZipCode(){ return zipCode; } setType(String newType){ type = newType; } setStreet(String newStreet){ street = newStreet; } setCity(String newCity){ city = newCity; } setState(String newState){ state = newState; } setZipCode(String newZip){ zipCode = newZip; } public Object copy(){ return new Address(street, city, state, zipCode); } public String toString(){ return "\t" + street + COMMA + " " + EOL_STRING + "\t" + city + COMMA + " " + state + " " + zipCode; } } 30 Singleton Pattern Properties Type: Creational Level: Object Purpose To have only one instance of this class in the system, while allowing other classes to get access to this instance.

Making Commands regular objects, thus allowing for all the normal properties. Easy addition of new Commands; just write another implementation of the interface and add it to the application. Pattern Variants Pattern variants include the following: Undo – The Command pattern lends itself to providing undo functions. When you extend the Command interface with an undo method, the burden of reversing the last command is placed on the implementing class. To support an undo for only the last command, the application needs to keep a reference only to the last command.

You don’t need to pass the reference to all objects needing this Singleton. However, the Singleton pattern can present threading problems, depending upon the implementation. You must take care regarding control of the singleton initialization in a multithreaded application. ” Pattern Variants Pattern variants include the following: One of the Singleton’s often-overlooked options is having more than one instance inside the class. The benefit is that the rest of the application can remain the same, while those that are aware of these multiple instances can use other methods to get other instances.

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