How to add two variables in java

/**
 * @author lautturi.com
 * Java example: addition in java 
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		int x=15;
      	int y=8;
      	int sum= x+y;
      	System.out.println("sum = "+sum);
		
		// if the variables are integers, you can use Integer.sum function:		
      	int total = Integer.sum(x,y);
      	System.out.println("sum = "+sum);
		
      	System.out.println("total = "+total);
		
		
	}

}

output

sum = 23
total = 23