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.
Output
*
**
****
********
****************
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