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Creating a dozen getter and setter methods by hand could take a while to complete. Fortunately, most modern IDEs have an automated way of creating getters and setters methods. Using this automated feature produces the methods with just a few mouse clicks. For example, in the Eclipse IDE, highlight the desired instance variable you wish to produce getters and setters for, followed by a right-click of the mouse. A popup menu will be displayed. Select Source followed by Generate Getters and Setters Another dialog box will be displayed with additional options that are not needed for this example. Finally, selecting the Ok pushbutton will generate the methods for you. See 7 for more information on getter and setter methods.
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In this chapter, some of the most fundamental concepts of Java were discussed in relationship to basic classes and variables. Even though the SCJA exam only has two objectives covering these concepts, many advanced concepts and objectives are built upon the content of this chapter. A good understanding of this chapter will result in a better understanding of the next few chapters. Java primitives were examined first. Primitives are the basic building blocks of a Java program. The four primitive variable data types that will appear on the SCJA are int, float, boolean, and char. It is important to remember these primitives and what type of data they are designed to store. Objects were then discussed. Objects are a very important concept to understand for the SCJA exam. Objects are an advanced Java data type that can be custom created or found in the many Java packages that are included with the Java Virtual Machine. Objects are the pieces that interact to make up an application. Java is an object-oriented language, which means that nearly every aspect of the program is represented as objects, and the interaction between the objects is what gives an application its functionality. Arrays were then discussed. Arrays are good for keeping like data together. They use a zero-based index to access the individual elements of the array. Arrays can be of objects or primitives and must be initialized. Enumerations were the last group of data types discussed. Enumerations are special objects that are used to denote a value among a pre-known set of values.
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Although regular objects can be used to achieve the same results, enumerations provide a way to limit the data set without implementing a lot of custom code. Next, the details of what makes Java a strongly typed language were examined. In general, the Java language only allows for variables to change data type by explicitly casting them to a new data type. If a variable is cast to a data type that it is not compatible with, an exception will be generated. The final Java concept covered was Java naming conventions. Even though there are very few limitations on how variables and classes can be named, it is good coding practice to follow the conventions used by nearly every Java developer. Not following these conventions is a quick way to test the patience of your fellow developers. The chapter concluded with a group of examples and explanations. These examples are important to understand. The SCJA will not ask you to write large sections of code, but you must be able to understand code segments and determine what the output will be or if there are any errors present in the code.
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q Primitives are the fundamental data type in Java. q int is a primitive data type that is used to store integer values. q float is a primitive data type that is used to store floating-point values. q boolean is a primitive data type that is used to store true or false values. q char is a primitive data type that is used to store a single Unicode character. q Primitive data types all start with a lowercase letter, while classes start with a
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