The break statements are necessary because without them, statements in switch blocks fall through: All statements after the matching case label are executed in sequence, regardless of the expression of subsequent case labels, until a break statement is encountered. Control flow continues with the first statement following the switch block. Each break statement terminates the enclosing switch statement. An if-then-else statement can test expressions based on ranges of values or conditions, whereas a switch statement tests expressions based only on a single integer, enumerated value, or String object.Īnother point of interest is the break statement. You could also display the name of the month with if-then-else statements:ĭeciding whether to use if-then-else statements or a switch statement is based on readability and the expression that the statement is testing. The switch statement evaluates its expression, then executes all statements that follow the matching case label. A statement in the switch block can be labeled with one or more case or default labels. The body of a switch statement is known as a switch block. For example, if the value of numDay variable is 1, the output will be Monday and for the value of 7, it should be Sunday.In this case, August is printed to standard output. After that, seven case statements are used one for each day of the Week. A variable is assigned a value (number of the day in Week) which is used as an expression in the switch statement. In this example, the switch statement is used with seven cases.
The figure below shows the syntax of switch-case statement. } An example of using switch case and default statements The switch-case statement is used when a variable needs to be compared against different values. Java statement here if case 2 is evaluated as trueĭefault: // It will execute if none of the case is true The variable used in a switch statement can only be integers, convertable integers (byte, short, char), strings and enums. It is not necessary that these case statements should be in ascending order. Each case value has a different integer number along with a default case. We pass this variable to the switch expression. We have an integer variable number with value as 3.
JAVA SWITCH CASE EXAMPLE CODE
But your code should use equals within the case statements to protect against hash collisions. So it can’t change in future versions and it’s even simpler to see that the algorithm hasn’t changed from Java 1.0 to Java 7 either. Java statement here if case 1 is evaluated as trueīreak // It will terminate the switch statement Let’s see a simple example of a switch case in java. Simply because Java7+ code using switch over string compiles to code assuming exactly that invariant property. The general way of using the switch case is: Structure of switch case statement in Java After that, I will explain the difference between the if and switch statement and which one to use depending on the scenario. See the following section for structure and examples of using the switch case statement. The break statement is necessary to exit the switch statement (see explanation in the first example).
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