Programming in Java summation is N series numbers

Programming in Java

package Test;
import java.util.Scanner;
public class SeriseforN {
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
       
        int n,sum=0;
        System.out.print("Enter the value of N:");
        n=input.nextInt();
       
        for (int i = 2; i <n; i=i+2) {
           
            sum=sum+i;
            System.out.print("  "+i);
        }
        System.out.println("");
        System.out.println("sumation is :"+sum);
    }
}

Programming is java summation between two numbers

Programming is java 

package test;
public class TwoNumberSummation {
    public static void main(String[] args) {
        int a,b,result;
        a=10;
        b=20;
        result=a+b;
       System.out.println ("summation is:"+result);
    }
}