In low level design, control structures like loops and conditionals are crucial for managing the flow of execution in a program.

Loops: Loops are used to repeat a set of instructions multiple times. They allow us to iterate over a collection of elements or perform a specific action until a certain condition is met. In Java, one common loop structure is the for loop. Here's an example of a for loop that prints numbers from 1 to 100:

1for(int i = 1; i <= 100; i++) {
2    System.out.println(i);
3}

Conditionals: Conditionals are used to execute different blocks of code based on certain conditions. They allow us to make decisions and control the flow of execution. In Java, one common conditional structure is the if-else statement. Here's an example of an if-else statement that checks if a number is divisible by 3, 5, or both and prints the corresponding message:

1int num = 15;
2
3if (num % 3 == 0 && num % 5 == 0) {
4    System.out.println("FizzBuzz");
5} else if (num % 3 == 0) {
6    System.out.println("Fizz");
7} else if (num % 5 == 0) {
8    System.out.println("Buzz");
9} else {
10    System.out.println(num);
11}

By effectively designing control structures, you can create programs that execute the desired actions and produce the expected results.

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    for(int i = 1; i <= 100; i++) {

      if(i % 3 == 0 && i % 5 == 0) {

          System.out.println("FizzBuzz");

      } else if(i % 3 == 0) {

          System.out.println("Fizz");

      } else if(i % 5 == 0) {

          System.out.println("Buzz");

      } else {

          System.out.println(i);

      }

    }

  }

}