Sum of first N Even and Odd numbers Java

PROGRAM TO FIND THE SUM OF FIRST N NATURAL EVEN NUMBERS AND ODD NUMBERS



import java.util.*;
import java.lang.*;
  
public class MAIN{
      
    // function to find sum of
    // first n even numbers
    static int evenSum(int n)
    {
        // required sum
        return (n * (n + 1));
    }
    
    // Returns the sum of first
    // n odd numbers
    static int oddSum(int n)
    {
        return (n * n);
    }
      
    // driver function
    public static void main(String args[])
    {
        int n = 20;
        System.out.println("Sum of first " + n 
            +" Even numbers is: " + evenSum(n));
        
        System.out.println(" Sum of first "+ n
            +" Odd Numbers is: "+ oddSum(n));
    }
}


OUTPUT
Sum of first 20 Even numbers is: 420
Sum of first 20 odd numbers is: 400

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