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boolean done = false; i = 0; for( ; !done; ) { Systemoutprintln("i is " + i); if(i == 10) done = true; i++; } } }
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Here, the initialization and iteration expressions have been moved out of the for Thus, parts of the for are empty While this is of no value in this simple example indeed, it would be considered quite poor style there can be times when this type of approach makes sense For example, if the initial condition is set through a complex expression elsewhere in the program or if the loop control variable changes in a nonsequential manner determined by actions that occur within the body of the loop, it may be appropriate to leave these parts of the for empty Here is one more for loop variation You can intentionally create an infinite loop (a loop that never terminates) if you leave all three parts of the for empty For example:
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for( ; ; ) { // }
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This loop will run forever because there is no condition under which it will terminate Although there are some programs, such as operating system command processors, that require an infinite loop, most infinite loops are really just loops with special termination requirements As you will soon see, there is a way to terminate a loop even an infinite loop like the one shown that does not make use of the normal loop conditional expression
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The For-Each Version of the for Loop
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Beginning with JDK 5, a second form of for was defined that implements a for-each style loop As you may know, contemporary language theory has embraced the for-each concept, and it is quickly becoming a standard feature that programmers have come to expect A foreach style loop is designed to cycle through a collection of objects, such as an array, in strictly sequential fashion, from start to finish Unlike some languages, such as C#, that implement a for-each loop by using the keyword foreach, Java adds the for-each capability by enhancing the for statement The advantage of this approach is that no new keyword is required, and no preexisting code is broken The for-each style of for is also referred to as the enhanced for loop The general form of the for-each version of the for is shown here: for(type itr-var : collection) statement-block Here, type specifies the type and itr-var specifies the name of an iteration variable that will receive the elements from a collection, one at a time, from beginning to end The collection being cycled through is specified by collection There are various types of collections that can be used with the for, but the only type used in this chapter is the array (Other types of collections that can be used with the for, such as those defined by the Collections Framework,
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5:
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Control Statements
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are discussed later in this book) With each iteration of the loop, the next element in the collection is retrieved and stored in itr-var The loop repeats until all elements in the collection have been obtained Because the iteration variable receives values from the collection, type must be the same as (or compatible with) the elements stored in the collection Thus, when iterating over arrays, type must be compatible with the base type of the array To understand the motivation behind a for-each style loop, consider the type of for loop that it is designed to replace The following fragment uses a traditional for loop to compute the sum of the values in an array:
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int nums[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int sum = 0; for(int i=0; i < 10; i++) sum += nums[i];
To compute the sum, each element in nums is read, in order, from start to finish Thus, the entire array is read in strictly sequential order This is accomplished by manually indexing the nums array by i, the loop control variable The for-each style for automates the preceding loop Specifically, it eliminates the need to establish a loop counter, specify a starting and ending value, and manually index the array Instead, it automatically cycles through the entire array, obtaining one element at a time, in sequence, from beginning to end For example, here is the preceding fragment rewritten using a for-each version of the for:
int nums[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int sum = 0; for(int x: nums) sum += x;
With each pass through the loop, x is automatically given a value equal to the next element in nums Thus, on the first iteration, x contains 1; on the second iteration, x contains 2; and so on Not only is the syntax streamlined, but it also prevents boundary errors Here is an entire program that demonstrates the for-each version of the for just described:
// Use a for-each style for loop class ForEach { public static void main(String args[]) { int nums[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int sum = 0; // use for-each style for to display and sum the values for(int x : nums) { Systemoutprintln("Value is: " + x); sum += x; } Systemoutprintln("Summation: " + sum); } }
Part I:
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