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Java Demystified
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The return statement is used in methods to return control back to the statement that called the method The return statement may or may not return a value You ll learn more about how to use the return statement in 6, where methods are introduced
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1 What is the normal flow of a program 2 What is an endless loop 3 What is the purpose of a conditional expression 4 Can a switch statement use a Boolean value as the switch variable 5 How is a constant used in a switch statement 6 What is the difference between a while loop and a do while loop 7 What is the purpose of a default statement in a switch statement 8 What does the term nested mean in relation to a control statement 9 What does the break statement do 10 What does the continue statement do
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Reserving memory to store data is a no-brainer You simply use a data type and a name to declare a variable You learned how this is done in 2 However, suppose you have to reserve memory for 100 data elements At first this may not seem challenging because all you need to do is declare 100 variables However, try doing this, and you ll discover that you need to come up with 100 unique and meaningful names one name for each variable Some programmers find themselves doing a little head-banging trying to name 100 variables Fortunately, there is a better way You can use an array instead of a variable An array requires one unique, meaningful name that can be used to reference all 100 data elements or as many data elements that you need for your program You ll learn about arrays in this chapter and see how to use them in your Java program
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Inside an Array
Previously in this book, you learned that before you can store data in computer memory you must first reserve memory Think of this as making sure there is an empty
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Java Demystified
bag available in which to place your groceries at the checkout counter before you begin checking out You use a data type to tell Java how much space to reserve in memory and the kind of data that you plan to store in that memory location For example, you ll recall that the char data type tells Java to reserve enough space in memory to store a char and that you ll be using that memory location to store a character Each memory location is uniquely identified by a memory address that s similar to an address for a house in your town You don t have to be concerned about memory addresses because Java takes care of them for you However, you do have to tell Java what name you ll be using in your program to refer to each memory address you ask Java to reserve The name you give to a memory address should reflect the nature of the data you ll be storing there For example, finalGrade might be a good name for a memory location that is used to store a student s final grade Java associates the name you provide with the memory address that is reserved for your data Each time you reference the name in your program, Java automatically looks up the corresponding memory address and then uses that memory address to store or retrieve data You reserve memory by using a declaration statement in your program, as shown here:
int finalGrade;
This statement tells Java to reserve memory sufficient enough to store an integer and that you ll be storing an integer in that location It also tells Java that you ll be calling that memory location by the name finalGrade within your program The name you give to a memory location is referred to as a variable primarily because you can change the value stored at that memory location countless times while your program runs Therefore, the value of a memory location varies An array is a collection of variables of the same data type, and the collection is assigned a name This collection is referred to as an array Each variable within the collection is called an array element An array element is identified by combining the array name and a unique index An index is an integer from zero to 1 minus the maximum number of elements in the array The index is contained within opening and closing square brackets to the right of the array name Let s say that we have declared an array called finalGrades and want to reference the first element of that array within our program Here s how you reference it:
finalGrades[0]
Notice that an array element is referenced nearly the same way you reference a variable, with one exception: Although both a variable and an array element have a unique and meaningful name, you reference the array element by specifying its index
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