Flow Control - General Questions

What does a labelled break do?

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                if (j == 1) continue;
                System.out.print(i + "" + j + " ");
            }
        }
        System.out.println();
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        int day = 3;
        switch (day) {
            case 1: System.out.print("A");
            case 3: System.out.print("B");
            case 4: System.out.print("C");
                break;
            default: System.out.print("D");
        }
    }
}

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 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);
    }
}