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Code

    ///Name: Conner Wygaerts
///Period: 6
///Project Name: SumThreeNums
///File Name: SumThreeNums.java
///Date Finished: 5/25/16
   
   import java.io.File;
    import java.util.Scanner;
    
    public class SumThreeNums {
    
        public static void main(String[] args) throws Exception {
            
            int a, b, c;
            
            Scanner fileIn = new Scanner(new File("nums.txt"));
            
            a = fileIn.nextInt();
            b = fileIn.nextInt();
            c = fileIn.nextInt();
            
            fileIn.close();
            
            int sum = a + b + c;
            System.out.println("\n" + a + " + " + b + " + " + c + " = " + sum);
            System.out.println();
        }
    }
    
  

Picture of the output