Flow Control - General Questions

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        int i = 0;
        do { i++; } while (i < 0);
        System.out.println(i);
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        String s = "b";
        switch (s) {
            case "a": System.out.print("A");
            case "b": System.out.print("B");
            case "c": System.out.print("C");
        }
        System.out.println();
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        int sum = 0;
        for (int i = 1; i <= 5; i++) sum += i;
        System.out.println(sum);
    }
}

What does a labelled break do?

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        int sum = 0;
        for (int v : new int[]{1, 2, 3, 4}) {
            if (v % 2 == 0) sum += v;
        }
        System.out.println(sum);
    }
}