Working with Control Flow Statements

if (user != null) {
    if (user.isAdmin()) {
        if (user.hasPermission("DELETE")) {
            performDelete();
        }
    }
}

switch (day) {
    case MONDAY:
    case TUESDAY:
        System.out.println("Workday");
        break;
    case SATURDAY:
        System.out.println("Weekend");
        break;
    default:
        System.out.println("Other");
}

String type = switch (day) {
    case MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY -> "Workday";
    case SATURDAY, SUNDAY -> "Weekend";
};

int len = switch (obj) {
    case String s -> s.length();
    case Integer i -> i;
    default -> 0;
};

sealed interface Shape permits Circle, Square, Triangle {}
record Circle(double r) implements Shape {}
record Square(double s) implements Shape {}
record Triangle(double b, double h) implements Shape {}

double area = switch (shape) {
    case Circle(double r)        -> Math.PI * r * r;
    case Square(double s)        -> s * s;
    case Triangle(double b, double h) -> 0.5 * b * h;
};

while (scanner.hasNextLine()) {
    String line = scanner.nextLine();
    process(line);
}

String input;
do {
    input = scanner.nextLine();
} while (!input.equals("quit"));

outer:
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        if (matrix[i][j] == target) break outer;
    }
}