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CHAPTER 4 Control Structures
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if ( a == b) { Systemoutprintln("a and b match"); } } } } }
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Under certain situations, you can avoid using a nested if statement and use a compound conditional expression instead A compound conditional expression consists of two relational expressions that are linked using a logical operator You ll recall from the previous chapter that there are two logical operators: the AND (&&) operator and the OR (||) operator The AND operator returns a Boolean true if both relational expressions are true; otherwise, a Boolean false is returned The OR operator returns a Boolean true if one of the relational expressions is true; otherwise, a Boolean false is returned The following example shows how to use a compound conditional expression in an if statement The form is also used for the elseif clause and any other place where you use a conditional expression in your program This example uses a compound conditional statement in the first if statement where Java is told to determine whether the value of a is greater than zero If so, Java evaluates the second relational expression to determine whether the value of b is greater than zero If a isn t greater than zero, the second expression is not evaluated because the compound expression requires both relational expressions to be true for the compound expression to be true (Refer to the previous chapter to learn how to force Java to evaluate both relational expressions) Only if both relational expressions are true will the compound expression be true and the statement within the first if statement executed Compare this example with the previous example and you ll notice how we eliminated one nested if statement by using a compound expression You should use a compound expression rather than a nested if statement wherever possible
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class Demo { public static void main (String args[]) { int a = 80, b = 90; if (a > 0 && b > 0) { if ( a == b) {
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Systemoutprintln("a and b match"); } } } }
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An alternative to using a long series of ifelse clauses in your if statements is to use the switch control statement, commonly referred to as a switchcase statement or simply the switch statement The switch statement tells Java to compare a value to one of many values, each of which is contained in a case statement If there is a match, Java executes the statements contained in the case statement The format of the switch statement is illustrated in the next example A switch statement has seven parts These are the keyword switch, the value used for comparison, braces that define the body of the switch statement, the case keyword, the case constant, the semicolon, and statements that are executed if the value matches the case value The switch keyword appears at the beginning of every switch statement and is followed by a value that is enclosed within parentheses The value must be a char, byte, short, or int data type and can be either a literal or a variable However, the value cannot be of any other data type or an expression The body of the switch statement should contain at least one case statement, but it can contain as many case statements as required by the program A case statement consists of the case keyword followed by a case constant, and it ends with a colon The case constant must be a literal that is of the char, byte, short, or int data type The case statement also consists of one or more statements that are executed if the value of the switch statement matches the case constant Here s what happens when Java executes the switch statement First, Java compares the value of the switch statement to the constant of the first case statement If there isn t a match, Java compares the value to the constant of the next case statement This continues until there is a match or until Java reaches the closing brace of the switch statement If there is a match, Java executes each statement contained beneath the case statement whose constant matches the switch value If one of those statements is the break statement, Java immediately exits the body of the switch statement and executes the next statement below the closing brace However, if there isn t a break statement, Java continues to compare the switch value against the constants of all the case statements that follow the case statement that matched the switch statement value
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