Answer:
Following are the code to this question:
//import package
import java.util.*;  
public class Full_XmasTree   //defining class 
{        
// defining main method
public static void main(String as[])  
    {  
        int X,a,b; //defining integer variable
        Scanner obx = new Scanner(System.in); // creating Scanner class object
        System.out.print("Please enter: "); //print message
        X = obx.nextInt(); // input value from user
        for (a = 0; a < X; a++) //defining loop to print pattern  
        {
            for (b = X - a; b > 1; b--)//use loop for print white space  
            {
            System.out.print(" ");//print space
            }
            for (b = 0; b <= a; b++) // use loop to print values  
            {
                System.out.print("* "); //print asterisk values
            }
            System.out.println(); //using print method for new line
        }
    }
}
Output:
please find the attachment.
Explanation:
In the given java code, a class "Full_XmasTree" is declared, in which the main method is declared, inside this method three integer variable "X, a, and b", in this variables "a and b" is used in a loop, and variable X is used for user input.
- In the next line, the Scanner class object is created, which takes input in variable X, and for loop is used to print asterisk triangle.
- In the first for loop, use variable a to count from user input value, inside the loop, two for loop is used, in which first is used to print white space and second is used for the print pattern.