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The for loop Iteration Statement
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The for loop statement is designed to iterate through code. It has main parts that include an initialization part, an expression part and an iteration part. The initialization does not need to declare a variable as long as the variable is declared before the for statement. So, int x = 0; and x=0; are both acceptable in the initialization part. Be aware though that the scope of the variable declared within the initialization part of the for loop ends once the for loop terminates. The expression within the for loop statement must evaluate to a boolean value. The iteration, also known as the update part, provides the mechanism that will allow the iteration to occur. A basic update part is represented as i++; . The general usage of the for statement: for ( initialization; expression; iteration) { // Sequence of statements } The following is an example of a basic for loop where the initialization variable is declared outside the for loop statement:
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int m; for (m = 1; m < 5; m++) { System.out.print("Marker " + m + ", "); } System.out.print("Last Marker " + m + "\n"); $ Marker 0, Marker 1, Marker 2, Marker 3, Marker 4, Last Marker 5
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The following is a similar example, but with the variable declared in the for loop:
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for (int m = 1; m < 5; m++) { System.out.print("Marker " + m + ", "); }
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Declaring the initialize variable in the for loop is allowed and is the common approach. However, you can t use the variable once you have exited the loop. The following will result in a compilation error:
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for (int m = 1; m < 5; m++) { System.out.print("Marker " + m + ", "); } System.out.print("Last Marker " + m + "\n"); // m is out of scope # Error: variable m not found in class [ClassName].
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Exposing Corner Cases with Your Compiler
The exam designers were not satisfied with just validating your knowledge of the fundamental Java material. They took the time to work in corner cases as well as modify the structure of the code in such a slight manner that it appears to be correct but is not. When you work through the examples in this book, take the time to modify things a bit, intentionally introducing errors, to see how the compiler reacts. Being able to think like the compiler will help you score higher on the exam. Third-party developers of Java development kits can define their own text for compiler error messages. Where they will likely try to model the messages provided by Sun s JDK, sometimes care will be taken to make the messages more precise. Consider invoking compiler errors with the latest Sun JDK compiler, as well as a compiler providing an IDE such as the Eclipse SDK. Compare the similarities and differences.
The Enhanced for loop Iteration Statement
The enhanced for loop is used to iterate through an array, a collection, or an object that implements the interface iterable. The enhanced for loop is also commonly known as the for each loop and the for in loop. Iteration occurs for each element in the array or iterable class. Remember that the loop can be terminated at any time by the inclusion of a break statement. And as with the other iteration statements, the continue statement will terminate the current iteration and start with the next iteration. The general usage of the for statement: for (type variable : collection) statement-sequence The following code segment demonstrates how a for loop can easily dump out the contents of an array. Here, the enhanced for loop iterates over each hook integer in the array hookSizes. For each iteration, the hook size is printed out.
int hookSizes[] = { 1, 1, 1, 2, 2, 4, 5, 5, 5, 6, 7, 8, 8, 9 }; for (int hook: hookSizes) System.out.print(hook + " "); $ 1 1 1 2 2 4 5 5 5 6 7 8 8 9
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