8/17/2023 0 Comments Java switch example![]() ![]() Related Java enum contentĪs I finish up my Java enum series, here’s a collection of the Java enum tutorials I’ve written. 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. It provides an easy way to dispatch execution to different parts of your code based on the value of an. 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. The switch statement is Javas multiway branch statement. 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. Example: Consider the following java program, it declares an int named day whose value represents a day (1-7). 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. A switch statement is another useful way to control the flow of program which is mostly used in those cases where we need our program to act on a single. switch-case statement can be used as the alternative of if-else-if statement where different conditions are defined in. 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 ![]() 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. ![]() loop through the enum values, calling the Java switch statement is like a conditional statement which tests multiple values and gives one output. * 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: It statement compares the value of a variable to the values specified in. Hopefully this enum/switch example adds a little more complexity to my earlier examples. In Java, the switch statement performs different actions based on various conditions. When it is an Integer it doesnt saying that a constant expression is required. In my code below if i is a int then it compiles. In this enum tutorial, I want to just focus on using an enum in a switch statement. Switch also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer (discussed in Numbers and Strings). 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. The answer to that is super simple, though, as it is fully determined by what you want to check for the switch variable.Java enum FAQ: Can you share a Java enum switch example, i.e., how to use an enum with a Java switch statement? ▚Labels vs PatternsĪfter that excursion into switch vs if, let's get back to when to use what form of switch. ![]() It communicates that much more clearly than an if- else- if chain and so I hope to some day see it being used in all such situations. Here's a bunch of possibilities for this value - pick one and compute. With switch becoming more powerful, my guess is that it will start to eat into the use cases for longer if- else- if chains.Īnd it makes sense because that's the core tenet of switch: translate `number`, then `callMethod` with it // as switch statement switch (number ) Īgain, this could be an if- else- if chain instead, but again I think the switch comes out ahead (for the same reasons as above). ![]()
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