How to draw a tree pattern in java

In this code we accept two input
1. A number(n) for the size of the tree
2. A character, with which we shalll draw the tree

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import java.util.Scanner;

public class Pattern

{

    public static void main(String[] args)

    {

        Scanner sc=new Scanner(System.in);

        String pad=" ";

        char ch= '*';

        System.out.println("ENTER NO OF LINES : ");

        int nLines=sc.nextInt();

        if(nLines%2==0){

            System.out.print("No. of line must be odd ");

            return;

        }

        int mid=(nLines+1)/2;

        for(int i=1;i<mid;i++){

            for(int j=1;j<=mid-i;j++){

                System.out.print(" "+pad);

            }

            for(int k=1; k<=2*i-1;k++){

                System.out.print(ch+pad);

            }

            System.out.println();

        }

        for(int i=mid-1; i>0; i--){

            for(int j=1; j<=mid-1;j++){

                System.out.print(" "+pad);

            }

            System.out.println(ch);

        }

    }

}

-----CODED BY SHOUVIK MITRA.