int day = 2;

// *** before: ***
switch (day) {
    case 1:
        System.out.println("Monday");
        // a forgotten break silently falls through to the next label
    case 2:
        System.out.println("Tuesday");
        break;
    default:
        System.out.println("another day");
}

// *** in version 14: ***
switch (day) {
    case 1 -> System.out.println("Monday");
    case 2 -> System.out.println("Tuesday");   // no fall-through at all
    default -> System.out.println("another day");
}