![]() ![]() Of improving the internal class structure of the game andĮxtending its functionality, and end with a long list of proposalsįor extensions that may be done as student projects. Issues of designing classes well, including concepts suchĪs responsibility-driven design, coupling, cohesion, and refactoring.Īn interactive, text-based, adventure game ( World of We discuss the traditional for loop as the most appropriate loop structure, and other array specifics.Ĩ, we discuss more formally the issues of dividingĪ problem domain into classes for implementation. System and a graphical simulation of a bouncing ball to applyħ goes back to collections, this time covering fixed-size collection, i.e. Random, Set and Map are examples of classes that In software development projects is discussed, and we endīy practicing how to write suitable documentation for our More importantly, we explain how to read and understand The Java standard library and discuss some important libraryĬlasses. The material in this chapter introduces concepts of functional programming, such as lambdas and streams, and revisits the processing of collections–just covered in the previous chapter–in this alternative style.Ħ deals with libraries and interfaces. This means that the material can be studied here, or it can initially be skipped if the reader wants to move forward more quickly. We discuss an implementation of a web log analyzer as an exampleĥ is labbelled as an "advanced" chapter. Of a collection, and the for loop as another form of a loop. Half of the chapter we introduce arrays as a special form The first collection being used is an ArrayList. Iterations over collection and have a first look at loops. We implement a music player and an auction Most importantly, we start using collections of We examine a simulation of an email system in which messagesĤ, we continue by building more extensive structures A digitalĪlarm clock display is discussed that uses two number display WeĪlso discuss how one object can create other objects. Invoking each otherÕs methods to perform a common task. Look back to the laboratory class example from chapter 1 toģ then enlarges the picture to discuss interaction The mainĮxample is an implementation of a ticket machine. We also introduce the first types of statements. We discuss how to define fields and implement methods. Java source code is written to create behavior of objects. We do thisīy using an example of graphical shapes which can be interactivelyĭrawn, and a second example of a simple laboratory class enrolmentĢ opens up class definitions and investigates how It also gives a first look at some source code. To these concepts without going into the details of Java syntax. In this event, the suggested convention is to add an underscore.Objects First With Java - A Practical Introduction Using BlueJġ deals with the most fundamental concepts of object-orientation: This can occur if the domain name contains a hyphen or other special character, if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as "int". In some cases, the internet domain name may not be a valid package name. Packages in the Java language itself begin with java. Name collisions that occur within a single company need to be handled by convention within that company, perhaps by including the region or the project name after the company name (for example, ). Package names are written in all lower case to avoid conflict with the names of classes or interfaces.Ĭompanies use their reversed Internet domain name to begin their package namesfor example, for a package named mypackage created by a programmer at. This works well unless two independent programmers use the same name for their packages. That is, the fully qualified name of the Rectangle class in the graphics package is graphics.Rectangle, and the fully qualified name of the Rectangle class in the java.awt package is. The fully qualified name of each Rectangle class includes the package name. ![]() Still, the compiler allows both classes to have the same name if they are in different packages. In fact, the previous example does just that: It defines a Rectangle class when there is already a Rectangle class in the java.awt package. With programmers worldwide writing classes and interfaces using the Java programming language, it is likely that many programmers will use the same name for different types. ![]()
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