Modified summation for demonstrations of try/catch and refactoring for reuse.

sum/src/main/java/edu/unl/cse/soft160/sum/Sum.java

@@ -3,14 +3,18 @@ package edu.unl.cse.soft160.sum;
 import java.util.Scanner;
 
 public class Sum {
-	public static void main(String[] args) {
-		Scanner firstScanner = new Scanner(args[0]);
-		double firstNumber = firstScanner.nextDouble();
-		firstScanner.close();
-		Scanner secondScanner = new Scanner(args[1]);
-		double secondNumber = secondScanner.nextDouble();
-		secondScanner.close();
-		double sum = firstNumber + secondNumber;
-		System.out.println("The sum is " + sum + ".");
+	public static void main(String... arguments) {
+		double augend = 0, firstAddend = 0, secondAddend = 0;
+		Scanner scanner = new Scanner(System.in);
+		System.out.print("Enter the augend: ");
+		augend = scanner.nextDouble();
+		System.out.print("Enter the first addend: ");
+		firstAddend = scanner.nextDouble();
+		System.out.print("Enter the second addend: ");
+		secondAddend = scanner.nextDouble();
+		scanner.close();
+		String message = augend + " + " + firstAddend + " + " + secondAddend + " = "
+				+ (augend + firstAddend + secondAddend);
+		System.out.println(message);
 	}
 }