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SCJA-drills-chap04

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What are primitives? Primitives are the fundamental data type in Java.
What is an int? int is a primitive data type that is used to store integer values.
What is a float? float is a primitive data type that is used to store floating-point values.
What is a boolean? boolean is a primitive data type that is used to store true or false values.
What is a char? char is a primitive data type that is used to store a single Unicode character.
What are the conventions regarding primitive versus class names? Primitive data types all start with a lowercase letter, while classes start with a capital letter.
What are the wrapper classes for each primitive? Each primitive data type has a corresponding wrapper class: Integer, Float, Boolean, and Character. Note the capital letters.
What are objects in relation to primitives? Objects are more advanced data types. They may be defined by a developer or found in a built-in Java package.
How are objects initialized? Objects must be initialized by using the new keyword.
What is the use of the 'new' keyword? Objects must be initialized by using the new keyword.
Define arrays and the way they are used. Arrays are objects and allow you to store multiple variables together that can be accessed by an index.
What are enumerations? Compare enumeration and variable usage. Enumerations are special objects that allow a developer to create a predefined set of constants. A variable can then be set to only one of the predefined values.
Complete the sentence and explain what is means: Java is a _______ (hint: weight) typed language. Java is a strongly typed language. Variables must be declared as a type, and any value that is stored must be compatible with this type.
What is cast and what happens if it is not properly used? It is possible to cast a variable to a different data type. If incompatible types are cast, an exception will be thrown.
What is a literal? A literal is a value that is hardcoded in code as the value itself.
What are the Java naming conventions regarding classes? Java naming conventions dictate that a class should be named with the first letter capitalized, along with each sequential word in the name.
What are the Java naming conventions regarding variables? Java naming conventions dictate that a variable should be named with the first letter being lowercase, and with each sequential word in the name beginning with a capital.
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