Downward triangle star pattern means we want to print a triangle that is downward facing means base is upwards and by default, orientation is leftwards so the desired triangle to be printed should look like
* * * * * * * * * *
Example
Java
// Java Program to Print Lower Star Triangle PatternÂ
// Main classpublic class GFG {Â
    // Main driver method    public static void main(String[] args)    {        // Nested 2 for loops for iteration over the matrixÂ
        // Outer loop for rows        int rows = 9;        for (int a = rows - 1; a >= 0; a--) {Â
            // Inner loop for columns            for (int b = 0; b <= a; b++) {Â
                // Prints star and space                System.out.print("*"                                 + " ");            }Â
            // By now we are done with single row so new            // line            System.out.println();        }    }} |
Output
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Using Recursion
Java
// added by Manish SharmaÂ
import java.io.*;Â
class GFG{         public static void printRow(int n)    {        if(n == 0) // base case        {             return;        }Â
          System.out.print("* ");          printRow(n - 1); // next * in the same row    }      public static void nextRow(int n)    {        if(n == 0)        {            return;        }          printRow(n); // prints the whole row recursively.        System.out.print("\n"); // for new line after printing a row...          nextRow(n - 1);    // changed to new row    }       public static void main (String[] args)    {        GFG.nextRow(5); // no need to create an object of GFG class as nextRow method is static.    }} |
Output
* * * * * * * * * * * * * * *
Time Complexity: O(n2), where n represents the given number of rows.
Auxiliary Space: O(1), no extra space is required, so it is a constant.
