![]() ![]() The switch statement shown in the above example begins by evaluating the year variable shown in the first line. default optionally is used prior to any action that should occur if the test variable does not match any case.break optionally terminates a switch statement at the end of each case.case is followed by one of the possible values for the test expression and a colon.switch starts the statement and is followed immediately by a test expression enclosed in parentheses. ![]() The switch statement is useful when you need to test a single variable against a series of exact integer (including int, byte, and short types), character, or string values. For example, suppose you want to display a student’s class year based on a stored number.Īn alternative to using the series of nested if statements shown in above example is to use the switch statement. You will understand about if else statement clearly via statement:īy nesting a series of if and else statements, you can choose from any number of alternatives. If you want to take an action when a Boolean expression is true but take a different action when the expression is false, you use an if else statement. In Java, when you want to take an action if a Boolean expression is true, you use an if statement. For example, the following statement displays true : The result of the comparison is a Boolean value: true or false. How do you compare two values, such as whether a distance is greater than 0, equal to 0, or less than 0? Java provides six relational operators (also known as comparison operators), shown in the following table, which can be used to compare two values: This is because computer circuitry consists of millions of tiny switches that are either on or off, and the result of every decision sets one of these switches in memory. That is, the answer to every computer question is yes or no (or true or false, or on or off). When reduced to their most basic form, all computer decisions are yes-or-no decisions.
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