Control flow statements in Java are used to determine the order in which statements are executed in a program. They allow you to make decisions, repeat actions, and perform different actions based on conditions.

1. if Statement

The if statement is used to test a condition. If the condition is true, the block of code inside the if statement is executed.

  public class Main {
    public static void main(String[] args) {
        int number = 10;

        if (number > 0) {
            System.out.println("The number is positive.");
        }
    }
}

2. if-else Statement

The if-else statement executes one block of code if the condition is true, and another block of code if the condition is false.

  public class Main {
    public static void main(String[] args) {
        int number = -10;

        if (number > 0) {
            System.out.println("The number is positive.");
        } else {
            System.out.println("The number is not positive.");
        }
    }
}

3. if-else if-else Statement

The if-else if-else statement allows you to test multiple conditions.

  public class Main {
    public static void main(String[] args) {
        int number = 0;

        if (number > 0) {
            System.out.println("The number is positive.");
        } else if (number < 0) {
            System.out.println("The number is negative.");
        } else {
            System.out.println("The number is zero.");
        }
    }
}

4. switch Statement

The switch statement allows you to select one of many code blocks to be executed.

  public class Main {
    public static void main(String[] args) {
        int day = 3;

        switch (day) {
            case 1:
                System.out.println("Monday");
                break;
            case 2:
                System.out.println("Tuesday");
                break;
            case 3:
                System.out.println("Wednesday");
                break;
            case 4:
                System.out.println("Thursday");
                break;
            case 5:
                System.out.println("Friday");
                break;
            case 6:
                System.out.println("Saturday");
                break;
            case 7:
                System.out.println("Sunday");
                break;
            default:
                System.out.println("Invalid day");
                break;
        }
    }
}

5. while Loop

The while loop repeats a block of code as long as a specified condition is true.

  public class Main {
    public static void main(String[] args) {
        int i = 1;

        while (i <= 5) {
            System.out.println(i);
            i++;
        }
    }
}

6. do-while Loop

The do-while loop is similar to the while loop, but it executes the block of code at least once before checking the condition.

  public class Main {
    public static void main(String[] args) {
        int i = 1;

        do {
            System.out.println(i);
            i++;
        } while (i <= 5);
    }
}

7. for Loop

The for loop is used to repeat a block of code a certain number of times.

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

8. for-each Loop

The for-each loop is used to iterate through elements of a collection or array.

  public class Main {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};

        for (int number : numbers) {
            System.out.println(number);
        }
    }
}

9. break Statement

The break statement is used to exit a loop or switch statement prematurely.

  public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            if (i == 3) {
                break;
            }
            System.out.println(i);
        }
    }
}

10. continue Statement

The continue statement is used to skip the current iteration of a loop and proceed to the next iteration.

  public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            if (i == 3) {
                continue;
            }
            System.out.println(i);
        }
    }
}