A Little Java, A Few Patterns by Matthias Felleisen

By Matthias Felleisen

Java is a brand new object-oriented programming language that used to be constructed through sunlight Microsystems for programming the web and clever home equipment. In a really short while it has develop into some of the most familiar programming languages for schooling in addition to advertisement applications.Design styles, that have moved object-oriented programming to a brand new point, supply programmers with a language to speak with others approximately their designs. for this reason, courses develop into extra readable, extra reusable, and extra simply extensible.In this ebook, Matthias Felleisen and Daniel Friedman use a small subset of Java to introduce pattern-directed software layout. With their ordinary readability and aptitude, they lightly advisor readers in the course of the basics of object-oriented programming and pattern-based layout. Readers new to programming, in addition to people with a few heritage, will take pleasure in their studying event as they paintings their method via Felleisen and Friedman's dialogue.

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LlS hO\v tu make all of True. ;s, which contains all the action. Chapter 4 Now take a look at this. 16 abstract class Shish v { I OnlyOnions v ooFn = new OnlyOnionsvO; abstract boolean onlyOnionsO; } I This is a strange set of definitions. All the only Onions methods in the variants look alike. Each of them uses an instance of OnlyOnions v , which is created in the datatype, to invoke a for method with a matching name. forTomato( s); } } Come to Our Carousel 59 If "consume" refers to what follows the name between parentheses, the method consumes s, \vhich is the rest of the shish.

III So what does the (Shish D s) mean in the definition of jorOnion? \rery good. "> no fields. It is always the rest of the shish, below the top layer, which is an onion. In other words. it is everything but the onion. 20 That makes sense and explains 8. onlyOnions (). stands for that shish. oTllyOnions(). jorOnion(s). jorOniou says that we want to use the method we just described. " So what is the value of new Onion( new Onion( new Skewer())) . onlyOnioTls()? And how do we determilH:' that value with these Ilew definitions?

Easy, it adds cheese on top of each anchovy: new Olive( new Cheese( new Anchovy( new Cheese( new Cheese( new Anchovy( new CrustO)))))). 1 A better name for these methods would be topAnchovywi thCheese. Did you notice the underlines? What's New? 33 Yes, they show where we added cheese. 49 Here \vt' dOlt"t add an~' cheese. hecau:-;e the pizza does not contain any anchovies: new Olive( new Cheese( new Sausage( new Crust()))). topAlvC()? DefiIle the remaiIling methods. \Ve expect you to know some of the answers.

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