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CHAPTER 2 Data Types and Variables
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Behind the scenes, Java stores a copy of the value that appears on the right of the assignment operator and stores the copy in the memory address that corresponds to the variable identifier in the statement A variable can be initialized using the following:
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A literal An expression Another variable
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The following example illustrates how to initialize a variable using literal values:
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class Demo { public static void main( String args[]) { int projectGrade = 0, finalGrade = 0, midTermGrade = 0; int quiz1 = 0; int quiz2 = 0; int quiz3 = 0; } }
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As you ll learn in the next chapter, an expression is a mathematical statement that contains operators and operands An operator is a symbol you use in arithmetic An operand is the value used by the operator to perform the operation For example, 5 + 10 is an expression The addition sign is the operator, and each of the numbers is an operand You can use the result of an expression to initialize a variable This is illustrated in the following example:
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class Demo { public static void main( String args[]) { int totalFee = 50 + 100 + 50; } }
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You can also initialize a variable by using another variable that has already been initialized This is illustrated in the next example, where four variables are declared The first three variables declare individual fees, each of which is initialized The last variable contains the total fee, which is initialized by using the previously declared variables Here s what Java is told to do: In the first declaration statement, Java is told to reserve memory sufficient to store an int, and that memory location will be called fee1 throughout the program Java is then told to copy the value 50 to that memory location A similar process occurs for the next two variables
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The last statement tells Java to reserve memory for another int, which will be called totalFee in the program Java is then told to add the values stored in fee1, fee2, and fee3 and copy the sum to the memory location that is associated with the variable totalFee It is important to understand that values stored in fee1, fee2, and fee3 remain intact while Java executes the last statement
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class Demo { public static void main( String args[]) { int fee1 = 50; int fee2 = 100; int fee3 = 50; int totalFee = fee1 + fee2 + fee3; } }
Scope of a Variable
A Java application is divided into sections of code call code blocks The beginning of a code block is defined by an open brace ({) and ends with a closed brace (}) As you ll see in later chapters, code blocks are used to define methods, classes, and control structures, such as if statements and loops We ll explore each of these later in this book For now, it is important to understand that a code block also defines the scope of a variable Other statements within the same code block can access a variable that is declared within a code block Statements outside the code block cannot access the variable, with a few exceptions that we ll talk about in the appropriate chapters A statement that can access a variable is said to be within the scope of the variable Programmers sometimes say that a variable is visible to the statement A statement that cannot access a variable is out of scope of the variable Programmers say the variable is hidden from the statement As you ll see in the next example, a code block can be placed within another code block This is referred to as nesting Variables declared in the outer code block are within the scope of statements in the inner code block However, variables declared in the inner code block are not within the scope of statements in the outer code block The next example contains three code blocks The outermost code block is used to define the class The next code block is used to define the main() method The innermost code block is used to define the if statement Statements within the if statement code block execute only if the value stored in the grade variable is zero
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