finished implementations of Dog.java, Factorial.java, IsInteger.java,

ThreeStrings.java

src/main/java/dog/Dog.java

@@ -11,16 +11,24 @@ package dog;
 
 
 public class Dog {
-    private String breed;
-    // Add an instance variable here for name.
 
-    public Dog(String theBreed)
+		// for my sanity (and out of habit), all member variables will be renamed to start with m
+		
+		// Member vars
+		
+    private String mBreed;
+		private String mName;
+
+		// Constructor
+    public Dog(String breed, String name)
     {
-        breed = theBreed;
+        breed = mBreed;
+				name = mName;
     }
 
+		//toString (no @Override?)
     public String toString()
     {
-        return breed;
+        return mName + " is a " + mBreed;
     }
 }

src/main/java/factorial/Factorial.java

@@ -20,7 +20,7 @@ public class Factorial {
 		public static int factorial(int n)
 		{
 				// Base case
-				if (n < 1) return n;
+				if (n <= 1) return 1;
 
 				// Recursive
 				return n * factorial(n - 1);

src/main/java/isInteger/IsInteger.java

@@ -8,12 +8,15 @@ public class IsInteger {
 		//    It is an integer if all of the characters in the string are digits.
 		//
 		//    Return true if it is an integer, or false if it is not.
-		public static isInteger(String input)
+		public static boolean isAnInteger(String input)
 		{
 
-				// Check if you can convert
-				
-
+				try {
+						Integer.parseInt(input);
+						return true;
+				}
+				catch(NumberFormatException e) {
+						return false;
+				}
 		}
-
 }

src/main/java/threeStrings/ThreeStrings.java

@@ -18,9 +18,47 @@ package threeStrings;
 //Third string? donuts
 //go + fish is not equal to donuts!
 
+import java.util.Scanner;
+
 public class ThreeStrings {
 
     public static void main(String[] args) {
+				Scanner scan = new Scanner(System.in);
+
+				// String vars
+				String string1;
+				String string2;
+				String string3;
+				String state = " is not ";
+
+				// Prompts
+				// First
+				System.out.print("First string? ");
+				string1 = scan.nextLine();
+
+				// Second
+				System.out.print("Second string? ");
+				string2 = scan.nextLine();
+
+				// Third
+				System.out.print("Third string? ");
+				string3 = scan.nextLine();
+
+				// Determinant
+				String concat = string1.concat(string2);
+				if (concat.equals(string3)) {
+
+						state = " is ";
+
+				}
+
+				// Result
+				System.out.println(string1 + " + " + string2 + state + "equal to " + string3 + "!");
+
+				
+
+				// Close the scanner
+				scan.close();
 
     }
 }