SarathKumarMca_SobhanThakur

import java.util.Scanner;

public class SarathKumarMca_SobhanThakur {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter number of lines of output wanted: ");
        final int numberOfOutputRows = sc.nextInt();//For no. of rows
        printNumberTriangle(numberOfOutputRows);
    }

    protected static void printNumberTriangle(final int numberOfOutputRows) {
        int numberToPrint = 0;
        for (int rowNum = 1; rowNum <= numberOfOutputRows; rowNum++) {
            numberToPrint = numberToPrint + rowNum;
            final boolean isAnOddRow = (rowNum % 2 != 0);
            for (int j = 1; j <= rowNum; j++) {
                if (isAnOddRow)
                    System.out.print(numberToPrint++ + " ");
                else
                    System.out.print(numberToPrint-- + " ");
            }
            System.out.println();
            if (isAnOddRow)
                numberToPrint--;
        }
    }

}