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Programming with Java Statements
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The enhanced for loop is frequently used for searching through items in a collection. Here, the enhanced for loop iterates over each hook Integer in the collection hookSizesList. For each iteration, the hook size is printed out. This example demonstrates the use of collections and generics.
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Integer hookSizeList; ArrayList<Integer> hookSizesList = new ArrayList<Integer>(); hookSizesList.add(1); hookSizesList.add(4); hookSizesList.add(5); for (Integer hook : hookSizesList) System.out.print(hook + " "); $ 1 4 5
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See Java Generics and Collections by Maurice Naftalin and Philip Wadler (O Reilly, October 2006) for comprehensive coverage of the Generics and Collections frameworks.
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ExERCISE 2-1 Iterating Through an ArrayList While Applying Conditions
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This exercise will have you iterating through an ArrayList of floats. Specifically, this exercise will have you printing out only the legal sizes of keeper fish. 1. Create an ArrayList of floats called fishLengthList. This list will represent the sizes of a few striped bass. 2. Add the following floats to the list: 10.0, 15.5, 18.0, 29.5, 45.5. These numbers represent the length in inches of the bass. 3. Iterate through the list, printing out only the numbers larger than the required length. Assume the required length is 28 inches.
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The while Iteration Statement
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The while statement is designed to iterate through code. The while loop statement evaluates an expression and only executes the while loop body if the expression evaluates to true. There is typically an expression within the body that will affect the result of the expression. The general usage of the while statement: while (expression) { // Sequences of statements }
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Understanding Fundamental Statements
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The following code example demonstrates the use of the while statement. Here, a fisherman will continue fishing until his fish limit has been reached. Specifically, when the fishLimit variable within the body of the while statement reaches 10, the fisherman s session will be set to inactive. Since the while statement demands that the session be active, its loop will terminate upon the change.
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fishingSession.setSession("active"); /* WHILE STATEMENT */ while (fishingSession.getSession().equals("active")) { castForFish(); // Updates fishLimit instance variable if (fishLimit == 10) { fishingSession.setSession("inactive"); } }
Various formatting styles can be followed when formatting your code. Formatting considerations include indentation, white space usage, line wrapping, code separation, and braces handling. You should select a style and maintain it throughout your code. For demonstration purposes, here are two distinct ways that braces are handled: K&R style braces handling: while (x==y) { performSomeMethod(); } Allman style brace handling: while (x==y) { performSomeMethod(); } Most IDEs support customizable formatting that can often be applied by selecting a format option from a menu. Using an IDE to ensure formatting is properly and consistently applied is a good idea. A popular Java code beautifier that is available as a plug-in to many tools is Jalopy: http://jalopy .sourceforge.net/jalopy/manual.html.
2:
Programming with Java Statements
The do-while Iteration Statement
The do-while statement is designed to iterate through code. It is very similar to the while loop statement except that it always executes the body at least once. The do-while loop evaluates an expression and only continues to execute the body if it evaluates to true. There is typically an expression within the body that will affect the result of the expression. The general usage of the do-while statement: do { // Sequence of statements } while (expression)
ExERCISE 2-2 Performing Code Refactoring
In the following code example, we want to make sure the fisherman gets at least one cast in. While this appears to make logical sense, you always need to think about corner cases. What if a fox steals the fisherman s bait before he gets a chance to cast In this case, the piecesOfBait variable would equal zero, but the fisherman would still cast as the body of the do-while loop is guaranteed at least one iteration. See if you can refactor this code with a while statement to avoid the possible condition of casting with no bait.
fishingSession.setSession("active"); int piecesOfBait = 5; piecesOfBait = 0; // Fox steals the bait! do { castForFish(); /* Check to see if bait is available */ if (fishingSession.isBaitAvailable() == false) { /* Place a new piece of bait on the hook */ fishingSession.setBaitAvailable(true); piecesOfBait--; } } while (piecesOfBait != 0);
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