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CHAPTER 4 Control Structures
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If you quickly read this program, you might think that the statement that displays the Goodbye! message is part of the if statement because there isn t anything in the program that tells you where the if statement ends Actually, the statement that displays the Hello world! message is the only statement contained within the if statement Hello world! is displayed only if the conditional expression is true Goodbye! is displayed regardless of whether the conditional expression in the if statement is true or false because the statement that displays the Goodbye! message is not part of the if statement The second form of the if statement is nearly identical to the first form; however, the second form uses opening and closing braces to designate statements that are to be executed if the conditional expression is true Here is the previous example using the second form of the if statement The second form of the if statement has four parts The first part is the keyword if The second part is the conditional expression contained within parentheses The third part is the body of the if statement that is defined by the opening and closing braces The fourth part is one or more statements executed if the conditional expression is true
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class Demo { public static void main (String args[]) { int a = 80, b = 90; if (a==b) { Systemoutprintln("Hello world!"); } Systemoutprintln("Goodbye!"); } }
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You have the option of using either form of the if statement if one statement is to be executed if the conditional expression is true However, you must use the second form of the if statement if more than one statement is executed if the conditional expression is true, and those statements must be contained with the opening and closing braces
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Here s a tip for avoiding a common compiler error when using the second form of the if statement Always insert the opening and closing brace into your program before writing statements that are to execute if the conditional expression is true This eliminates any chance that you will forget to include the closing brace in the if statement, which is an oversight that even professional Java programmers sometimes make
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As previously mentioned in this chapter, the conditional expression can be as simple as the Boolean value true This is illustrated in the next example Although using the keyword true as the conditional expression is equivalent to a relational expression evaluating true, it really doesn t make any sense to use it in the if statement because the statements within the if statement will always execute You could simply eliminate the if statement to achieve the same results However, using the keyword true as the conditional expression does makes sense when it s used in an iteration control statement, which you ll learn about later in this chapter
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class Demo { public static void main (String args[]) { if (true) { Systemoutprintln("Hello world!"); } Systemoutprintln("Goodbye!"); } }
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The else Clause
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Many times programmers combine an if statement with an else clause An else clause provides one or more alternative statements that are executed when the conditional expression in the if statement is false Think of the else clause as telling Java to execute one or more statements if Java doesn t execute the statements within the if statement The else clause has two forms that are nearly identical to the two forms of the if statement The first form is without opening and closing braces and is used to execute only one statement This is illustrated in the next example where the Goodbye! message is displayed only if the conditional expression in the if statement is evaluated false
class Demo { public static void main (String args[]) { int a = 80, b = 90; if (a==b) Systemoutprintln("Hello world!"); else Systemoutprintln("Goodbye!"); } }
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