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CHAPTER 4 Control Structures
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The second form of the else clause uses opening and closing braces within which you place one or more statements that are executed if the conditional expression is not true The following example shows how this form of the else clause is used in a Java program You can include any number of statements within the braces of the else clause, although only one statement is shown in this example
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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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You can mix and match forms of the if statement with forms of the else clause, depending on the nature of your program There isn t any requirement that these forms match For example, you can use an if statement without braces with an else statement that uses braces, and vice versa Basically, if you have one statement to execute, don t use the braces; otherwise, use the braces
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The else if clause is a combination of the else clause and the if statement It lets you tell Java to evaluate another conditional expression Think of the else if clause as saying, If the first condition isn t true, evaluate the second condition If the second condition is true, execute these statements The else if clause takes the same forms as the if statement That is, the else if clause requires a conditional expression contained within parentheses and a statement that is executed if the condition is true You also have the option of using opening and closing braces As with the if statement and the else clause, the braces are optional if the else if clause executes one statement, and they are required if multiple statements are executed The following example shows you how to use the else if clause This example uses a conditional expression in the if statement to tell Java to compare values of two variables If they are the same value, the message a and b match is displayed on the screen If they don t match, the condition in the else if clause tells Java to
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determine whether variable a is less than variable b If this is true, the message a is less than b is displayed
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class Demo { public static void main (String args[]) { int a = 80, b = 90; if (a==b) Systemoutprintln("a and b match"); else if ( a < b) Systemoutprintln("a less than b"); } } }
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It is very common for programmers to include an else clause in whenever an else if clause is used in order to give Java instructions to follow if neither the if statement and else if clause conditional expressions are false Think of the else clause as the default action Java should perform unless one of the previous conditions are met The next example illustrates how to use the else clause in this manner This example displays the message a is greater than b We make this the default action because this is the only condition that could exist if the previous two conditions are not true If a is not equal to b and a is not less than b, then a must be greater than b Therefore, we use an else clause instead of an else if clause to test the condition if a is greater than b
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class Demo { public static void main (String args[]) { int a = 80, b = 90; if (a==b) Systemoutprintln("a and b match"); else if ( a < b) Systemoutprintln("a is less than b"); else Systemoutprintln("a is greater than b"); } } }
Too much of a good thing isn t good, and this is true about the else if clause Using too many else if clauses makes a program difficult for other programmers to read, although the length doesn t impair Java s ability to carry out your instructions If you find yourself using a lot of else clauses in the same if statement, you should replace the if statement and all those else clauses with a switch control
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