I don't understand this code , please help me

Question

String daytype= switch(day)

Answer 1

Incomplete code

Answer 2

Java 12 introduced new feature that you can use switch as normal expression which return a single value.

An example way I used in this code:

int start = switch(season) {
case "W" -> 1;
case "V" -> 4;
case "S" -> 7;
case "F" -> 10;
default -> 0;
};
in this example : 'start' gets assigned a value depending upon season value..

https://code.sololearn.com/cUhWk7vED7ak/?ref=app
hope it helps..

Answer 3

I know but I ask for why we use this statement and when

Answer 4

This is an example of how you would use it in Java 14 or higher:

String daytype= switch(day) {
case "monday", "tuesday", "wednesday", "thursday", "friday" -> "Weekday";
case "saturday", "sunday" -> "Weekend";
default -> "Invalid day";
};

You would use it to avoid bulky code like this:

if (day.equals("monday") {
daytype = "Weekday";
} else if (day.equals("tuesday") {
daytype = "Weekday";
} else if (day.equals("wednesday") {
daytype = "Weekday";
} else if (day.equals("thursday") {
daytype = "Weekday";
} else if (day.equals("friday") {
daytype = "Weekday";
} else if (day.equals("saturday") {
daytype = "Weekend";
} else if (day.equals("sunday") {
daytype = "Weekend";
} else {
daytype = "Invalid day.";
}