ConstructTriangle.java

import java.util.*;
public class ConstructTriangle {

	public void Triangle(int[] A) {
		if (A.length >= 1) {
			int[] temp = new int[A.length - 1];
			for (int i = 0; i < A.length - 1; i++) {
				int x = A[i] + A[i + 1];
				temp[i] = x;
			}
			Triangle(temp);
			System.out.println(Arrays.toString(A));
		}
	}

	public static void main(String[] args) {
		int[] A = { 1, 2, 3, 4, 5 };
		ConstructTriangle c = new ConstructTriangle();
		c.Triangle(A);

	}

}