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The for loop is especially useful for flow control when you already know how many times you need to execute the statements in the loop s block. The for loop declaration has three main parts, besides the body of the loop:
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Declaration and initialization of variables The boolean expression (conditional test) The iteration expression
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Each of the three for declaration parts is separated by a semicolon. The following two examples demonstrate the for loop. The first example shows the parts of a for loop in a pseudocode form, and the second shows typical syntax of the loop.
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for (/*Initialization*/ ; /*Condition*/ ; /* loop body */ } for (int i = 0; i<10; i++) { System.out.println("i is " + i); } /* Iteration */) {
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Declaration and Initialization
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The first part of the for statement lets you declare and initialize zero, one, or multiple variables of the same type inside the parentheses after the for keyword. If you declare more than one variable of the same type, then you ll need to separate them with commas as follows:
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for (int x = 10, y = 3; y > 3; y++) { }
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The declaration and initialization happens before anything else in a for loop. And whereas the other two parts the boolean test and the iteration expression will run with each iteration of the loop, the declaration and initialization happens just once, at the very beginning. You also must know that the scope of variables declared in the for loop ends with the for loop! The following demonstrates this:
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for (int x = 1; x < 2; x++) { System.out.println(x); // Legal } System.out.println(x); // Not Legal! x is now out of scope and can't be accessed.
If you try to compile this, you ll get
Test.java:19: cannot resolve symbol symbol : variable x location: class Test System.out.println(x); ^
4: Flow Control, Exceptions, and Assertions
Conditional (boolean) Expression
The next section that executes is the conditional expression, which (like all other conditional tests) must evaluate to a boolean value. You can have only one logical expression, but it can be very complex. Look out for code that uses logical expressions like this:
for (int x = 0; ((((x < 10) && (y-- > 2)) | x == 3)); x++) { }
The preceding code is legal, but the following is not:
for (int x = 0; (x > 5), (y < 2); x++) { } // too many //expressions
The compiler will let you know the problem:
TestLong.java:20: ';' expected for (int x = 0; (x > 5), (y < 2); x++) { } ^
The rule to remember is this: You can have only one test expression. In other words, you can t use multiple tests separated by commas, even though the other two parts of a for statement can have multiple parts.
Iteration Expression
After each execution of the body of the for loop, the iteration expression is executed. This part is where you get to say what you want to happen with each iteration of the loop. Remember that it always happens after the loop body runs! Look at the following:
for (int x = 0; x < 1; x++) { // body code here }
The preceding loop executes just once. The first time into the loop x is set to 0, then x is tested to see if it s less than 1 (which it is), and then the body of the loop executes. After the body of the loop runs, the iteration expression runs, incrementing x by 1. Next, the conditional test is checked, and since the result is now false, execution jumps to below the for loop and continues on. Keep in mind that this iteration expression is always the last thing that happens ! So although the body may never execute again, the iteration expression always runs at the end of the loop block, as long as no
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other code within the loop causes execution to leave the loop. For example, a break, return, exception, or System.exit() will all cause a loop to terminate abruptly, without running the iteration expression. Look at the following code:
static boolean doStuff() { for (int x = 0; x < 3; x++) { System.out.println("in for loop"); return true; } return true; }
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