Conditions and loops

if / else, switch expressions, for, the enhanced for, and while.

Runs in Zerethon IDE · Java 25 Official Java documentation ↗

Main.java

public class Main {
    public static void main(String[] args) {
        for (int n = 1; n <= 4; n++) {
            if (n % 2 == 0) {
                System.out.println(n + " even");
            } else {
                System.out.println(n + " odd");
            }
        }

        String[] days = {"SAT", "MON"};
        for (String day : days) {
            String kind = switch (day) {
                case "SAT", "SUN" -> "weekend";
                default -> "weekday";
            };
            System.out.println(day + " is a " + kind);
        }

        int i = 3;
        while (i > 0) {
            i--;
            if (i == 1) continue;
            System.out.println("i = " + i);
        }
        System.out.println(i == 0 ? "done" : "not yet");
    }
}

Output

1 odd
2 even
3 odd
4 even
SAT is a weekend
MON is a weekday
i = 2
i = 0
done

Tip: The arrow form case X -> value does not fall through and can return a value; the old case X: form needs break.

Conditions and loops

Related topics

Official references