Note: Note that unlike some other languages, the continue statement applies to switch and acts similar to break. If you have a switch inside a loop and wish to continue to the next iteration of the outer loop, use continue 2.
The if, if-else and switch statements select statements to execute from many possible paths based on the value of an expression. The if statement executes a statement only if a provided Boolean expression evaluates to true. The if-else statement allows you to choose which of the two code paths to follow based on a Boolean expression. The switch statement selects a statement list to execute based on a pattern match with an expression.
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The preceding example also demonstrates the default case. The default case specifies statements to execute when a match expression doesn't match any other case pattern. If a match expression doesn't match any case pattern and there's no default case, control falls through a switch statement.
A switch statement executes the statement list in the first switch section whose case pattern matches a match expression and whose case guard, if present, evaluates to true. A switch statement evaluates case patterns in text order from top to bottom. The compiler generates an error when a switch statement contains an unreachable case. That is a case that is already handled by an upper case or whose pattern is impossible to match.
The default case can appear in any place within a switch statement. Regardless of its position, the default case is evaluated only if all other case patterns aren't matched or the goto default; statement is executed in one of the switch sections.
Within a switch statement, control can't fall through from one switch section to the next. As the examples in this section show, typically you use the break statement at the end of each switch section to pass control out of a switch statement. You can also use the return and throw statements to pass control out of a switch statement. To imitate the fall-through behavior and pass control to other switch section, you can use the goto statement.
A case pattern may be not expressive enough to specify the condition for the execution of the switch section. In such a case, you can use a case guard. That is an additional condition that must be satisfied together with a matched pattern. A case guard must be a Boolean expression. You specify a case guard after the when keyword that follows a pattern, as the following example shows:
Unlike if-then and if-then-else statements, the switch statement can have a number of possible execution paths. A switch works with the byte, short, char, and int primitive data types. It 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).
The body of a switch statement is known as a switch block. A statement in the switch block can be labeled with one or more case or default labels. The switch statement evaluates its expression, then executes all statements that follow the matching case label.
Deciding whether to use if-then-else statements or a switch statement is based on readability and the expression that the statement is testing. 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.
Another point of interest is the break statement. Each break statement terminates the enclosing switch statement. Control flow continues with the first statement following the switch block. 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. The program SwitchDemoFallThrough shows statements in a switch block that fall through. The program displays the month corresponding to the integer month and the months that follow in the year:
Technically, the final break is not required because flow falls out of the switch statement. Using a break is recommended so that modifying the code is easier and less error prone. The default section handles all values that are not explicitly handled by one of the case sections.
In Java SE 7 and later, you can use a String object in the switch statement's expression. The following code example, StringSwitchDemo, displays the number of the month based on the value of the String named month:
The String in the switch expression is compared with the expressions associated with each case label as if the String.equals method were being used. In order for the StringSwitchDemo example to accept any month regardless of case, month is converted to lowercase (with the toLowerCase method), and all the strings associated with the case labels are in lowercase.
Note: This example checks if the expression in the switch statement is null. Ensure that the expression in any switch statement is not null to prevent a NullPointerException from being thrown.
Like if statements, switch case controls the flow of programs by allowing programmers to specify different code that should be executed in various conditions. In particular, a switch statement compares the value of a variable to the values specified in case statements. When a case statement is found whose value matches that of the variable, the code in that case statement is run.
The break keyword exits the switch statement, and is typically used at the end of each case. Without a break statement, the switch statement will continue executing the following expressions ("falling-through") until a break, or the end of the switch statement is reached.
Summary: Toggle switches are digital on/off switches. They prompt users to choose between two mutually exclusive options and always have a default value. Toggles should provide immediate results, giving users the freedom to control their preferences as needed.
Toggle switches are best used for changing the state of system functionalities and preferences. Toggles may replace two radio buttons or a single checkbox to allow users to choose between two opposing states.
When designers use the appropriate UI element for a specific scenario, it helps users predict what the UI element will do and how to control it. To avoid user frustration and ensure comprehension, follow these guidelines on toggle switches.
Toggle switches should take immediate effect and should not require the user to click Save or Submit to apply the new state. As always, we should strive to match the system to the real world. Consider my tea kettle: I should not have to flip the switch off and unplug the cord to experience the change in state. Consequently, users expect the same immediate results from a digital toggle as they do from their real-world counterparts (e.g., light switches). Immediate results are a facet of toggle switches that grants users the freedom and control to update their preferences as needed.
Toggles help users update preferences, settings, and other types of information. When using toggles, provide direct labels, use standard visual design, and deliver immediate results. Keep in mind that toggle switches should only be used when the user needs to decide between two opposing states. As you review the use of toggles on your site or app, evaluate the context and ensure that they are implemented consistently. Remember, this simple user-interface component can make a big impact on user experience.
By switching to edit mode, users can modify settings and export a new file. Switch lets you specify a new file format; a new video or audio codec; trim, scale or crop the video; add metadata (Pro only), and much more. Export to Apple ProRes*, Windows Media, H264, MPEG-2 Video, MP4, MPEG-2 program streams and transport streams.
With Switch Control, you can use switches to select, tap, or drag items, type, and even freehand draw. Just use a switch to select an item or location on the screen, then use the switch to choose an action.
Add a new switch
 Turn Switch Control on or off
 Use Switch Control
 Change your settings
 Add a new switch Before you add an external switch, you need to connect it to your device before it will show in the list of switches. You can use any of these options as a switch:
If you use multiple switches, you can set up each switch to perform a specific action and customize how you select items. For example, instead of automatically scanning items, you can set up switches to move to the next or previous item on demand. If you just have one switch, keep using Auto Scanning.
Select the gesture or action from the menu that appears when you select the item. If you turned on Auto Tap, use your switch within the Auto Tap interval, then select the gesture. If more than one page of actions is available, select the dots at the bottom of the menu to go to another page.
The switch itself does not maintain any state. Instead, when the state ofthe switch changes, the widget calls the onChanged callback. Most widgetsthat use a switch will listen for the onChanged callback and rebuild theswitch with a new value to update the visual appearance of the switch.
If the onChanged callback is null, then the switch will be disabled (itwill not respond to input). A disabled switch's thumb and track are renderedin shades of grey by default. The default appearance of a disabled switchcan be overridden with inactiveThumbColor and inactiveTrackColor.
This example shows a toggleable Switch. When the thumb slides to the otherside of the track, the switch is toggled between on/off. link To create a local project with this code sample, run:
 flutter create --sample=material.Switch.1 mysample
This example shows how to customize Switch using MaterialStatePropertyswitch properties. link To create a local project with this code sample, run:
 flutter create --sample=material.Switch.2 mysample be457b7860
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