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/** * A program to print the words to the Twelve Days of Christmas * @author Carl Reynolds */ public class DaysOfChristmas { public static void main(String args[]) { int dayOfChristmas = 1; //start with the 1st day of Christmas while( dayOfChristmas <= 12 ) { if( dayOfChristmas == 1 ) { System.out.println( "A partridge in a pear tree \n" ); }//if else { switch( dayOfChristmas ) { case 12: System.out.println( "Twelve drummers drumming" ); case 11: System.out.println( "Eleven pipers piping" ); case 10: System.out.println( "Ten lords a-leaping" ); case 9: System.out.println( "Nine ladies dancing" ); case 8: System.out.println( "Eight maids a-milking" ); case 7: System.out.println( "Seven swans a-swimming" ); case 6: System.out.println( "Six geese a-laying" ); case 5: System.out.println( "Five golden rings" ); case 4: System.out.println( "Four calling birds" ); case 3: System.out.println( "Three French hens" ); case 2: System.out.println( "Two turtle doves" ); System.out.println( "And a partridge in a pear tree \n" ); break; default: System.out.println( " Day = " + dayOfChristmas ); }//switch }//else dayOfChristmas++; }//while System.out.println("The End" ); }//main }//class OBJECT-ORIENTED PROGRAMMING Java is an object-oriented language, which means that Java facilitates the writing of object-oriented programs. Object orientation is more a matter of how one thinks about programming than it is a particular programming technique. When one writes object-oriented code, one thinks of software things that are analogous to things in the outside world. For instance, if our job is to write software for the State Thruway Authority for automated toll collection, we would think about the job differently depending upon whether we take the older procedural approach or the newer object-oriented (OO) approach.
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Using the procedural approach, we would break the job down into subtasks, or subroutines, write the routines, and combine the routines with a main program into a sequence of activities to be performed. We might have a carEntersThruway procedure, and a carExitsThruway procedure, and we might keep information in a file about the cars using the Thruway. Using the OO approach, we would think about the things in our problem domain, and create analogous software classes. For instance, we would probably have a Vehicle class, and we might have a ThruwayInterchange class, and a VehicleOwner class. We would give Vehicles characteristics that are important to our application, such as licenseNumber, state, make, model, and color. Since we need to track where vehicles enter and leave the Thruway, we might add Vehicle properties enteredAtInterchange and exitedAtInterchange. Likewise, the properties of a VehicleOwner might include firstName, lastName, streetAddress, city, state, and zipCode. The logic of an OO program gets coded as methods of the objects. Instead of having an isolated or application-wide carEntersThruway procedure, as we might using the procedural approach, we can have similar code in a method of the Vehicle class. The logic may be the same, but in the OO approach we think of a Vehicle object having behaviors appropriate to the application. When a Vehicle enters the Thruway, we will call the Vehicle s enterThruway method, and the Vehicle object will deal appropriately with that event. The data one operates on and the logic one encodes may be the same for the procedural approach and the object-oriented approach, but the object-oriented approach organizes the work differently. When an objectoriented program is complete, a set of classes is the result. These classes, if well designed, can be reused and extended more easily so that future programming projects have a head start. Putting the code inside classes also allows functionality to be encapsulated, which leads to more effective testing and more reliable use later on. The software classes exist as their own entities, with known properties (attributes), and well-defined methods. Using inheritance, the OO approach also offers a standard way to add functionality without changing at all the code that has already been written. There is less temptation to modify the classes that have already been defined, implemented and tested. The result is usually more stable and reliable code. Object orientation is an advance in how programmers think about their work. The OO approach leads to software classes which more closely model the real world, and therefore make the application more natural to think about. In addition, building classes usually leads to code which is more easily reused. Both effects lead to better programming productivity. CLASSES AND OBJECTS People new to OO programming often have difficulty distinguishing what are called classes from what are called instances. A class is a specification, a blueprint, or maybe even a concept, like vehicle; an instance is a specific example of a class. From the class Automobile, one can build or identify particular cars. My Ford with vehicle ID 1FABP64T1JH100161 is said to be an instance of the class Automobile. Often the word object is used as a synonym for the word instance. One also says that my Ford is an object of the class Automobile. This can be confusing, especially at first, because Java, like some other OO languages, also recognizes a class called Object (capital O). In fact, every class in Java inherits from the class Object (we will discuss inheritance soon); the class Object is the root of the Java class hierarchy. Though the use of the word in two senses can be confusing, generally one should understand the word object to mean instance, unless the word Object is capitalized. We say that <an instance> is <a class>. Some writers say that an is-a relationship exists between an instance and its class. For instance, my Ford is an Automobile. OBJECT STATE AND BEHAVIOR Grady Booch, a well-known writer on the topic of OO programming, has defined an object as something that has state, behavior, and identity. In other words, an object has characteristics (which may change over time), an object can perform certain prespecified actions, and an object provides us a way to refer to it.
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