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Code

    ///Name: Joshua Bautista
    ///Period: 6
    ///Date: 6/4/16
    
    import java.io.File;
    import java.util.Scanner;
    
    public class SN {
        
        public static void main(String[] args) throws Exception {
            
            Scanner fileIn = new Scanner(new File("3nums.txt"));
            
            int num1 = fileIn.nextInt();
            int num2 = fileIn.nextInt();
            int num3 = fileIn.nextInt();
            
            int sum = num1 + num2 + num3;
            
            System.out.println(num1 + " + " + num2 + " + " + num3 + " = " + sum);
        }
    }
    

Picture of the output