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Control Statements
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A control statement tells Java to alter the sequence in which statements are executed within a program There are three kinds of control statements: selection statements, iteration statements, and jump statements A selection control statement tells Java to evaluate an expression If the expression is true, Java is told to execute one or more statements If the expression is false, Java is told either to skip those statements or to execute a different set of statements The ifelse control statement briefly discussed in the previous chapter is an example of a selection control statement An iteration statement tells Java to execute one or more statements repeatedly Programmers refer to an iteration statement as a loop because, after the last statement is executed within the iteration statement, Java automatically returns to the
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CHAPTER 4 Control Structures
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top of the iteration statement (the top of the loop) and begins executing the instructions again A jump statement transfers control to another part of the program The return statement is a jump statement used in many programs to transfer control from a method back to the statement that called the method
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Selection Statements
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A selection statement tells Java to evaluate a condition and then decide whether or not to execute one or a set of statements, depending on whether the condition is true There are two types of selection statements: the if statement and the switch statement The if statement tells Java that if an expression is true, then execute these statements Some programming languages call the if statement an ifthen statement Both have the same effect on a program Typically, the if statement is combined with an else statement The else statement contains another set of statements that are executed if the expression isn t true Programmers call this combination an ifelse statement The switch statement tells Java to compare the value in the switch statement to values stored in one or more case statements If there is a match, the statements defined in the corresponding case statement are executed The switch statement is also known as the switchcase statement
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The if Statement
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The if statement is the most commonly used control statement to have Java make a decision The if statement directs Java to evaluate an expression If the expression is true, Java is told to execute one or more statements within the if statement Otherwise, if the expression is not true, those statements are skipped The expression evaluated in an if statement is called a conditional expression A conditional expression must evaluate to a Boolean value That is, the expression must evaluate to either a true or false value An expression used as a conditional expression for the if statement that evaluates to something other than a Boolean value will cause a compiler error A conditional expression is typically a relational expression As you ll recall from the last chapter, a relational expression determines whether two values are the same or different by using a relational operator The result can be only true or false
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Java Demystified
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A conditional expression can also be the keyword true or false without any operators and operands For example, if you place the keyword true in the conditional expression of the if statement, the statements within the if statement will be executed You ll see how this is done later in this chapter You could also use the keyword false in the conditional expression, but that wouldn t make any sense because statements within the if statement will never execute
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Forms of the if Statement
The if statement has two forms: One form is an if statement without a code block, and the other form is an if statement with a code block Let s take a look at the first form of the if statement The first form of the if statement has three parts, as shown in the following example The first part is the keyword if The second part is the conditional expression The conditional expression must be contained within parentheses The third part is one statement that is executed if the conditional expression is true Only one statement can be executed in the first form of the if statement The second form of the if statement must be used if multiple statements need to be executed if the conditional expression is true In this example, Java is told to compare the value of variable a and variable b If they match, Java executes the statement that displays a message on the screen If they are different, the statement is skipped
class Demo { public static void main (String args[]) { int a = 80, b = 80; if (a==b) Systemoutprintln("Hello world!"); } }
Some programmers find that the first form of the if statement can cause confusion when a program is being read because there isn t any symbol that tells you where the end of the if statement is This becomes evident in the next example, where another statement appears below the statement within the if statement What is displayed on the screen when this program executes
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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