Explanation:

Input: N = 10

Output: First 10 Numbers = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Sum of first 10 Natural Number = 55

Input: N = 5

Output: First 5 Numbers = 1, 2, 3, 4, 5

Sum of first 5 Natural Number = 15

Approach

Start for loop initialization with i = 1.

Write testing condition as i <= N.

Add increment statement as i++ or i+=1.

Initialize a variable sum with 0.

Start adding i with the sum at each iteration of for loop and print i.

Print sum at the end for loop.

Below is the implementation of above approach

// Java Program to Display Numbers

// from 1 to N Using For Loop and

// sum of First N Natural Number

import java.io.*;

class GFG {

public static void main(String[] args)

{

int N = 10;

int sum = 0;

System.out.print("First " + N + " Numbers = ");

// we initialize the value of the variable i

// with 1 and increment each time with 1

for (int i = 1; i <= N; i++) {

// print the value of the variable as

// long as the code executes

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

sum += i;

}

System.out.println();

System.out.println("Sum of first " + N

+ " Natural Number = " + sum);

}

}