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Casting Variables to Different types
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Java does allow a variable to be cast to a different type. To cast a variable, place the new data type in parentheses in front of the data, or variable. Data can only be cast to types it is compatible with. If data is illegally cast, the program will throw an exception at runtime. An object can be cast to any parent or child object if the object was initialized as that child object. This is an advanced concept of object-oriented
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Understanding Primitives, Enumerations, and Objects
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languages. This will be discussed in more detail in later chapters. Primitives can also be cast to other primitives or compatible objects. For example, a float can be cast to an int. In this scenario, the cast would truncate the float to a whole number. The following are some examples of casting variables and data:
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float floatNum = 1.5f; int wasFloat = (int) floatNum;
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The variable wasFloat would be equal to 1 since the .5 would be truncated to make the data compatible. Casting variables is something that a developer should use lightly.There are times that variables must be cast, and even advanced programming techniques that rely on it. However, casting variables just adds unneeded complexity to the code when there are better ways to convert that data.
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Naming Conventions
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Using the correct naming conventions while creating a Java application is a critical step in creating easy reading and maintainable code. Java does not have many restrictions on how classes and objects can be named. However, nearly every experienced Java developer uses a single naming convention suggested by Sun Microsystems. When creating a class, the class name should be a noun. The first letter should be capitalized along with each internal word after the first. They should be short yet descriptive. Shown next are some examples of good class names following the naming convention.
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class SportCar { } class BaseballPlayer { } class Channel { }
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Variables should also have short but meaningful names. However, it is okay to use one-letter names for temporary variables. Their name should give an outside observer some insight as to what the variable is used for. A variable s name should start with a lowercase letter, but each sequential internal word should be capitalized. Shown next is a sample of some variables named following the convention.
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int milesPerGallon; float price; int i; Car raceCar;
4:
Working with Basic Classes and Variables
The SCJA exam will ask questions about which variable is a primitive data type and which is an object. If you don t have a firm understanding of each, the answers may be confusing. An important rule to remember is the SCJA exam will always follow proper Java naming conventions and start object data types with a capital letter and begin primitive data types with a lowercase letter. For example, a float is a primitive data type and a Float is an object.
CertIFICatION OBJeCtIVe
practical Uses of primitives, enumerations, and Objects
Exam Objective 3.1 Develop code that uses primitives, enumeration types, and object references, and recognize literals of these types. This section will build on the fundamental concepts that were discussed in the previous sections. The SCJA exam will not require code to be written from scratch. However, the exam creators have decided to present scenarios where the candidate will need to determine the best-suited code from a list of segments. The exam will also present segments of code and ask varying questions about its elements. This section specifically covers literals and practical examples of primitives, enumerations, and objects.
literals
A literal is a term used for a hardcoded value used within code. The following example demonstrates the use of literals:
int daysInMay = 31; int daysInJune; daysInJune = 30; char y = 'Y';
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