Following is an example of a fall through switch case. All the statements are executed even if the test expression is satisfied. Whenever there is no break statement involved in a switch case block. Output: advance java Fall Through Switch Case Following is an example showing a nested switch case. Nested switch case incorporates another switch case in an existing switch case. The default statement is optional as well, it can appear anywhere in the block.įlow Chart Examples Break Statement In Switch Caseīreak statement is used to control the flow of the execution, as soon as the expression is satisfied the execution moves out the switch case block. It is not necessary to include the break statement, the execution will move to the next statement if the break statement is missing. The break statement fulfills the purpose of terminating the sequence during execution. Variables are not allowed in a case, it must be a constant or a literal. The values in the case and the data type of the variable in a switch case must be same. We cannot declare duplicate values in a switch case. Following are a certain points to remember while writing a switch case in java. There are a certain rules one must keep in mind while declaring a switch case in java. Following is the syntax of using a switch case in Java. After the release of java 7 we can even use strings in the cases. These multiple values that are tested are called cases. Java switch statement is like a conditional statement which tests multiple values and gives one output. Following are the topics discussed in this article: In this article, you will learn about switch case in java with various examples. Using a switch case in java optimizes the readability of the code while working on multiple test expressions. Hustle free logic building using the switch case results in improved efficiency. Related Java enum contentĪs I finish up my Java enum series, here’s a collection of the Java enum tutorials I’ve written.Java programming language has conditional and control statements which optimizes the logic while writing a program. Between my original Java enum tutorial and this tutorial, I hope it helps to see at least two examples of how to use a custom enum type with a switch statement (sometimes called a case statement). I hope this Java enum switch statement example has been helpful. If a calling program manages to somehow call this method with a different Day value - something which should be really hard to do, unless I add a new value to the Day enum - flow of control will fall down to the default expression. For the values MONDAY through THURSDAY I print one String for FRIDAY I print a different string and SATURDAY and SUNDAY print their own string. The printTodaysThought method takes one Day value ( theDay), and compares that variable against the constants that are shown in the switch statement. That’s really the only “trick” in this code the rest of it is a standard Java 5 for loop, and it calls the printTodaysThought method once for each constant in the Day enum. This “enum for loop” iterates through all the values in the Day enum, using the values method that comes with Java’s enum type. Inside main I jump right in with this for loop: DiscussionĪs with any Java program, the flow of control starts in the main method. The output is in this order because the enum begins on SUNDAY, and goes in order from there until SATURDAY. When you compile and run this code, the output looks like this: Public static void printTodaysThought(Day theDay)Ĭase THURSDAY: ("Working for the man :)") Ĭase FRIDAY: ("TGIF ") Ĭase SUNDAY: ("Ahh, the weekend. a method that prints a String corresponding to the day value loop through the enum values, calling the * A Java enum switch statement (switch/case) example. Let’s take a look at the Java source code for my enum example, and then I’ll describe it afterwards: Then in the main portion of the program, I refer to that enum, both in my main method, and in the “print” method that I call from the main method. SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY In this enum/switch example, I first declare an enum type that looks like this: Hopefully this enum/switch example adds a little more complexity to my earlier examples. In this enum tutorial, I want to just focus on using an enum in a switch statement. In my earlier Java enum examples tutorial, I demonstrated how to declare a simple Java enum, and then how to use an enum with a variety of Java constructs, including a Java switch statement, a for loop, and an if/then statement. Java enum FAQ: Can you share a Java enum switch example, i.e., how to use an enum with a Java switch statement?
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