Chapter 12, Problem 2E

Explanation of Solution

Program code:

// class definition

class Main

{

  //main method

  public static void main(String[] args)

  {

    //call method with 5

    writeNums(5);

    //new line

    System.out.println();

    //call method with 12

    writeNums(12);

      //new line

    System.out.println();

     //call method with -1

    writeNums(-1);

      //new line

    System.out.println();

  }

 //method definition

 public static void writeNums(int n)

  {

    //condition to validate the n value

    if (n < 1)

    {

       //throws exception

        throw new IllegalArgumentException();