Switch Expressions

Example

public class Main {
    public static void main(String[] args) {
        int day = 6;
        String type = switch (day) {
            case 1, 2, 3, 4, 5 -> "Weekday";
            case 6, 7 -> "Weekend";
            default -> "Invalid day";
        };
        System.out.println(type);

        int month = 2;
        int days = switch (month) {
            case 4, 6, 9, 11 -> 30;
            case 2 -> 28;
            default -> 31;
        };
        System.out.println("Days: " + days);
    }
}

Output

Weekend
Days: 28

Example

When a case needs several statements, use a block and return the value with yield.

public class Main {
    public static void main(String[] args) {
        String plan = "GOLD";
        double amount = 1000;
        double payable = switch (plan) {
            case "SILVER" -> amount * 0.95;
            case "GOLD" -> {
                double discount = amount * 0.10;
                System.out.println("Gold discount: " + discount);
                yield amount - discount;
            }
            default -> amount;
        };
        System.out.println("Payable: " + payable);
    }
}

Output

Gold discount: 100.0
Payable: 900.0