Schleifen

public class Zaehlen {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            System.out.print(i + " ");
        }
        System.out.println();
        int summe = 0;
        for (int i = 1; i <= 100; i++) summe += i;
        System.out.println(summe);
        for (int i = 10; i > 0; i -= 3) System.out.print(i + " ");
        System.out.println();
    }
}

public class Bedingt {
    public static void main(String[] args) {
        int n = 1;
        while (n < 100) n *= 2;
        System.out.println(n);

        int versuche = 0;
        do {
            versuche++;
        } while (versuche < 3);                // läuft mindestens einmal
        System.out.println(versuche);
    }
}

import java.util.List;

public class Jeder {
    public static void main(String[] args) {
        String[] farben = {"rot", "grün", "blau"};
        for (String f : farben) System.out.print(f + " ");
        System.out.println();
        List<Integer> zahlen = List.of(4, 8, 15);
        int s = 0;
        for (int z : zahlen) s += z;
        System.out.println(s);
        for (char c : "Java".toCharArray()) System.out.print(c + "-");
        System.out.println();
    }
}

public class Sprung {
    public static void main(String[] args) {
        for (int i = 1; i <= 10; i++) {
            if (i % 2 == 0) continue;     // gerade überspringen
            if (i > 7) break;             // abbrechen
            System.out.print(i + " ");
        }
        System.out.println();

        aussen:
        for (int a = 1; a < 10; a++) {
            for (int b = 1; b < 10; b++) {
                if (a * b == 42) {
                    System.out.println(a + " * " + b);
                    break aussen;         // beide Schleifen verlassen
                }
            }
        }
    }
}

public class Tabelle {
    public static void main(String[] args) {
        for (int zeile = 1; zeile <= 4; zeile++) {
            for (int spalte = 1; spalte <= 5; spalte++) {
                System.out.printf("%4d", zeile * spalte);
            }
            System.out.println();
        }
        for (int i = 1; i <= 4; i++) System.out.println(" ".repeat(4 - i) + "*".repeat(2 * i - 1));
    }
}

public class Algos {
    public static void main(String[] args) {
        int[] z = {5, 3, 9, 1, 7};
        int max = z[0], min = z[0], summe = 0;
        for (int x : z) {
            if (x > max) max = x;
            if (x < min) min = x;
            summe += x;
        }
        System.out.println("max " + max + ", min " + min + ", Schnitt " + (double) summe / z.length);

        // Primzahlen bis 30
        for (int n = 2; n <= 30; n++) {
            boolean prim = true;
            for (int t = 2; t * t <= n; t++) if (n % t == 0) { prim = false; break; }
            if (prim) System.out.print(n + " ");
        }
        System.out.println();

        // FizzBuzz
        for (int i = 1; i <= 15; i++) {
            System.out.print((i % 15 == 0 ? "FizzBuzz" : i % 3 == 0 ? "Fizz" : i % 5 == 0 ? "Buzz" : i) + " ");
        }
        System.out.println();
    }
}