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of x is 2, thus causing the conditional expression to be false Java no longer enters the for loop and instead goes to the statement beneath the for loop There isn t any, so the program ends
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class Demo { public static void main (String args[]) { for (int x = 0; x < 2; x++) Systemoutprintln("Current value of x = " + x); } }
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Although the previous example has one statement within a for loop, you can include multiple statements within a for loop by using opening and closing braces, similar to how braces are used in the if statement Here is how to format the for loop to use multiple statements:
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class Demo { public static void main (String args[]) { for (int x = 0; x < 2; x++) { Systemoutprintln ("Current value of x:"); Systemoutprintln(x); } } }
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Alternative Initialization Expression
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The for loop is very flexible because various forms of the three expressions can be used with the for loop Also, as you ll see later in this chapter, a for loop doesn t require any expression For now, let s take a look at the first of two alternative forms of initialization expression In the following example, the control variable is declared outside of the initialization expression of the for loop; however, the initialization expression still sets the initial value of the control variable:
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class Demo { public static void main (String args[]) { int x; for (x = 0; x < 2; x++) Systemoutprintln("Current value of x = " + x); } }
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CHAPTER 4 Control Structures
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This next example illustrates a second alternative to the initialization expression In this example, the initialization expression is inserted in the program before the for loop There isn t an initialization expression in the for loop; however, the for loop still needs the semicolon that follows what would normally be the initialization expression in the for loop The advantage of declaring and initializing the control variable outside the for loop is so that the control variable can be used by statements outside of the for loop
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class Demo { public static void main (String args[]) { int x = 0; for (; x < 2; x++) Systemoutprintln("Current value of x = " + x); } }
Alternative Conditional Expression
An alternative form of the conditional expression is also used with a for loop This is to use a Boolean value instead of a relational expression that evaluates to a Boolean value For example, you could simply use the keyword true as the conditional expression This transforms the for loop into an endless loop An endless loop is a loop where a statement within the body of the loop controls when the loop ends There are three ways in which to create an endless for loop The first way is to use a Boolean variable initialized to true as the conditional expression A statement within the body of the for loop then changes the value of the variable to false This is shown in the next example, which begins by declaring a Boolean variable called y and initializing it to true Variable y is then used as the conditional expression in the for loop The control variable x is initialized in the initialization expression and incremented in the iteration expression However, it is not used in the conditional expression Instead, the control variable is used in the conditional expression of an if statement within the body of the for loop If the control variable is 5, the value of y is changed to false in the if statement, thus causing Java to break out of the loop
class Demo { public static void main (String args[]) { boolean y = true; for (int x = 0; y ; x++ ) { Systemoutprintln("Current value of x = " + x); if (x == 5)
y = false; } } }
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