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The Java Language
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for(int j=0; j < 5; j++) nums[i][j] = (i+1)*(j+1); // use for-each for to display and sum the values for(int x[] : nums) { for(int y : x) { Systemoutprintln("Value is: " + y); sum += y; } } Systemoutprintln("Summation: " + sum); } }
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The output from this program is shown here: Value is: 1 Value is: 2 Value is: 3 Value is: 4 Value is: 5 Value is: 2 Value is: 4 Value is: 6 Value is: 8 Value is: 10 Value is: 3 Value is: 6 Value is: 9 Value is: 12 Value is: 15 Summation: 90 In the program, pay special attention to this line:
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for(int x[] : nums) {
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Notice how x is declared It is a reference to a one-dimensional array of integers This is necessary because each iteration of the for obtains the next array in nums, beginning with the array specified by nums[0] The inner for loop then cycles through each of these arrays, displaying the values of each element
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Since the for-each style for can only cycle through an array sequentially, from start to finish, you might think that its use is limited, but this is not true A large number of algorithms require exactly this mechanism One of the most common is searching For example, the following program uses a for loop to search an unsorted array for a value It stops if the value is found
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Control Statements
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// Search an array using for-each style for class Search { public static void main(String args[]) { int nums[] = { 6, 8, 3, 7, 5, 6, 1, 4 }; int val = 5; boolean found = false; // use for-each style for to search nums for val for(int x : nums) { if(x == val) { found = true; break; } } if(found) Systemoutprintln("Value found!"); } }
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The for-each style for is an excellent choice in this application because searching an unsorted array involves examining each element in sequence (Of course, if the array were sorted, a binary search could be used, which would require a different style loop) Other types of applications that benefit from for-each style loops include computing an average, finding the minimum or maximum of a set, looking for duplicates, and so on Although we have been using arrays in the examples in this chapter, the for-each style for is especially useful when operating on collections defined by the Collections Framework, which is described in Part II More generally, the for can cycle through the elements of any collection of objects, as long as that collection satisfies a certain set of constraints, which are described in 17
Nested Loops
Like all other programming languages, Java allows loops to be nested That is, one loop may be inside another For example, here is a program that nests for loops:
// Loops may be nested class Nested { public static void main(String args[]) { int i, j; for(i=0; i<10; i++) { for(j=i; j<10; j++) Systemoutprint(""); Systemoutprintln(); } } }
Part I:
The Java Language
The output produced by this program is shown here:
Jump Statements
Java supports three jump statements: break, continue, and return These statements transfer control to another part of your program Each is examined here
NOTE In addition to the jump statements discussed here, Java supports one other way that you
can change your program s flow of execution: through exception handling Exception handling provides a structured method by which run-time errors can be trapped and handled by your program It is supported by the keywords try, catch, throw, throws, and finally In essence, the exception handling mechanism allows your program to perform a nonlocal branch Since exception handling is a large topic, it is discussed in its own chapter, 10
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