Building Java Programs: A Back to Basics Approach (4th Edition)
Building Java Programs: A Back to Basics Approach (4th Edition)
4th Edition
ISBN: 9780134322766
Author: Stuart Reges, Marty Stepp
Publisher: PEARSON
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Chapter 12, Problem 1E

Explanation of Solution

Program code:

// class definition

class Main

{

  //main method

  public static void main(String[] args)

  {

    //loop that iterates for the values

    for(int i=0;i<=4;i++)

    //display the starstring

    System.out.println(starString(i));

  }

  //method definition

  public static String starString(int n)

  {

    //condition to validate the value passed

    if (n < 0)

    {

        //throw illegal argument exception

        throw new IllegalArgumentException();

    }

    //else part for value 0 

    else if (n == 0)

    {

        //return *

        return "*";

    }

    //else part

    else

    {

        //return the string

        return starString(n - 1) + starString(n - 1);

    }

}

}

Explanation:

  • The method “starString” is used to print the star to the console and it made by validating the value of n using “if” condition.
  • If the value of n is less than 0 then illegal argument exception is passed.
  • If the value of n is equal to 0 then the “*” is returned.
  • If the value is greater than 0 then recursively the function “starString” is executed to print the string.

Expert Solution & Answer
Check Mark
Sample Output

Output

*

**

****

********

****************

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