Med Java

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====== Java 12 Enhanced Switch ======

===== Classic switch (before Java 12) =====

<code java ClassicSwitchExample.java>
public class ClassicSwitchExample {
    public static void main(String[] args) {
        String day = "Monday";
        String typeOfDay;

        switch (day) {
            case "Monday":
                typeOfDay = "Start of work week";
                break;
            case "Friday":
                typeOfDay = "End of work week";
                break;
            case "Saturday":
            case "Sunday":
                typeOfDay = "Weekend";
                break;
            default:
                typeOfDay = "Midweek day";
                break;
        }

        System.out.println(day + " is a " + typeOfDay);
    }
}
</code>

===== Enhanced switch (starting with Java 12) =====

<code java EnhancedSwitchExample.java>
public class EnhancedSwitchExample {
    public static void main(String[] args) {
        String day = "Monday";
        String typeOfDay;

        typeOfDay = switch (day) {
            case "Monday" -> "Start of work week";
            case "Friday" -> "End of work week";
            case "Saturday", "Sunday" -> "Weekend";
            default -> "Midweek day";
        };

        System.out.println(day + " is a " + typeOfDay);
    }
}
</code>

<note>
  - In the enhanced version, the switch is used as an expression, which means it can directly return a value. 
  - Using the -> syntax eliminates the need for the break keyword, as each case is treated as a singular expression, and there's no "fall-through" to the next case. 
  - In the cases for Saturday and Sunday, we've combined the two cases into one for efficiency and clarity, demonstrating another improvement brought by the modern switch.
</note>