Added some exception handling

src/main/java/mattrixwv/Algorithms.java

@@ -30,6 +30,8 @@ import java.security.InvalidParameterException;
 import java.util.ArrayList;
 import java.util.Collections;
 
+import mattrixwv.exceptions.InvalidResult;
+
 
 public class Algorithms{
 	//This function returns a list with all the prime numbers <= goalNumber
@@ -305,7 +307,7 @@ public class Algorithms{
 		return primes;
 	}
 	//This function returns all factors of goalNumber
-	public static ArrayList<Integer> getFactors(Integer goalNumber){
+	public static ArrayList<Integer> getFactors(Integer goalNumber) throws InvalidResult{
 		//You need to get all the primes that could be factors of this number so you can test them
 		Double topPossiblePrime = Math.ceil(Math.sqrt(goalNumber));
 		ArrayList<Integer> primes = getPrimes(topPossiblePrime.intValue());
@@ -331,12 +333,15 @@ public class Algorithms{
 			goalNumber /= goalNumber;
 		}
 
-		//TODO: If for some reason the goalNumber is not 1 throw an error
+		//If for some reason the goalNumber is not 1 throw an error
+		if(goalNumber != 1){
+			throw new InvalidResult("The factor was not 1: " + goalNumber);
+		}
 
 		//Return the list of factors
 		return factors;
 	}
-	public static ArrayList<Long> getFactors(Long goalNumber){
+	public static ArrayList<Long> getFactors(Long goalNumber) throws InvalidResult{
 		//You need to get all the primes that could be factors of this number so you can test them
 		Double topPossiblePrime = Math.ceil(Math.sqrt(goalNumber));
 		ArrayList<Long> primes = getPrimes(topPossiblePrime.longValue());
@@ -362,12 +367,15 @@ public class Algorithms{
 			goalNumber /= goalNumber;
 		}
 
-		//TODO: If for some reason the goalNumber is not 1 throw an error
+		//If for some reason the goalNumber is not 1 throw an error
+		if(goalNumber != 1){
+			throw new InvalidResult("The factor was not 1: " + goalNumber);
+		}
 
 		//Return the list of factors
 		return factors;
 	}
-	public static ArrayList<BigInteger> getFactors(BigInteger goalNumber){
+	public static ArrayList<BigInteger> getFactors(BigInteger goalNumber) throws InvalidResult{
 		//You need to get all the primes that could be factors of this number so you can test them
 		BigInteger topPossiblePrime = goalNumber.sqrt();
 		ArrayList<BigInteger> primes = getPrimes(topPossiblePrime);
@@ -393,7 +401,10 @@ public class Algorithms{
 			goalNumber.divide(goalNumber);
 		}
 
-		//TODO: If for some reason the goalNumber is not 1 throw an error
+		//If for some reason the goalNumber is not 1 throw an error
+		if(!goalNumber.equals(BigInteger.ONE)){
+			throw new InvalidResult("The factor was not 1: " + goalNumber);
+		}
 
 		//Return the list of factors
 		return factors;

src/main/java/mattrixwv/Stopwatch.java

@@ -19,11 +19,12 @@ Copyright (C) 2020  Matthew Ellison
 	You should have received a copy of the GNU Lesser General Public License
 	along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
-
-
 package mattrixwv;
 
 
+import mattrixwv.exceptions.InvalidResult;
+
+
 public class Stopwatch{
 	private Long startTime;
 	private Long stopTime;
@@ -36,7 +37,6 @@ public class Stopwatch{
 	//Returns a long with the elapsed time in nanoseconds. Used by other functions to get the time before converting it to the correct resolution
 	private Long getTime(){
 		if(startTime == null){
-			//TODO: This should throw an exception instead of returning 0
 			return 0L;
 		}
 		else if(stopTime == null){
@@ -71,36 +71,36 @@ public class Stopwatch{
 		stopTime = null;
 	}
 	//Returns the time in nanoseconds
-	public double getNano(){
+	public double getNano() throws InvalidResult{
 		return getTime().doubleValue();
 	}
 	//Returns the time in microseconds
-	public double getMicro(){
+	public double getMicro() throws InvalidResult{
 		return getTime().doubleValue() / 1000D;
 	}
 	//Returns the time in milliseconds
-	public double getMilli(){
+	public double getMilli() throws InvalidResult{
 		return getTime().doubleValue() / 1000000D;
 	}
 	//Returns the time in seconds
-	public double getSecond(){
+	public double getSecond() throws InvalidResult{
 		return getTime().doubleValue() / 1000000000D;
 	}
 	//Returns the time in minutes
-	public double getMinute(){
+	public double getMinute() throws InvalidResult{
 		return getTime().doubleValue() / 60000000000D;
 	}
 	//Returns the time in hours
-	public double getHour(){
+	public double getHour() throws InvalidResult{
 		return getTime().doubleValue() / 3600000000000D;
 	}
 	//Returns the time as a string at the 'best' resolution. (Goal is xxx.xxx)
-	public String getStr(){
+	public String getStr() throws InvalidResult{
 		//Get the current duration from time
 		return getStr(getTime().doubleValue());
 	}
 
-	public static String getStr(double nanoseconds){
+	public static String getStr(double nanoseconds) throws InvalidResult{
 		Double duration = nanoseconds;
 		//Reduce the number to the appropriate number of digits. (xxx.x).
 		//This loop works down to seconds
@@ -135,7 +135,7 @@ public class Stopwatch{
 			case MINUTE: time += " minutes"; break;
 			case HOUR: time += " hours"; break;
 			case ERROR:
-			default: time = "There was an error computing the time"; break;	//TODO: This should throw an error instead
+			default: throw new InvalidResult("timeResolution was invalid");
 		}
 		//Return the string
 		return time;
@@ -143,6 +143,11 @@ public class Stopwatch{
 
 	@Override
 	public String toString(){
-		return getStr();
+		try{
+			return getStr();
+		}
+		catch(InvalidResult error){
+			return "There was an error in getStr(): " + error;
+		}
 	}
 }

src/main/java/mattrixwv/exceptions/InvalidResult.java

@@ -0,0 +1,17 @@
+//JavaClasses/src/main/java/mattrixwv/Exceptions/InvalidResult.java
+//Matthew Ellison
+// Created: 08-24-20
+//Modified: 08-24-20
+//This is an exception for an invalid result out of one of my algorithms
+package mattrixwv.exceptions;
+
+
+public class InvalidResult extends Exception{
+	private static final long serialVersionUID = 1L;
+	public InvalidResult(){
+		super();
+	}
+	public InvalidResult(String msg){
+		super(msg);
+	}
+}

src/test/java/mattrixwv/TestAlgorithms.java

@@ -32,6 +32,8 @@ import java.util.Arrays;
 
 import org.junit.Test;
 
+import mattrixwv.exceptions.InvalidResult;
+
 
 public class TestAlgorithms{
 	@Test
@@ -75,7 +77,7 @@ public class TestAlgorithms{
 		assertEquals("getNumPrimes BigInteger failed", bigCorrectAnswer, bigAnswer);
 	}
 	@Test
-	public void testGetFactors(){
+	public void testGetFactors() throws InvalidResult{
 		//Test 1
 		ArrayList<Integer> correctAnswer = new ArrayList<Integer>(Arrays.asList(2, 2, 5, 5));
 		Integer number = 100;

src/test/java/mattrixwv/TestStopwatch.java

@@ -29,6 +29,8 @@ import static org.junit.Assert.assertNotEquals;
 
 import org.junit.Test;
 
+import mattrixwv.exceptions.InvalidResult;
+
 public class TestStopwatch{
 	private static final Integer NUM_TO_RUN = 100000;
 	private static final Double ALLOWANCE = .0000000001;
@@ -40,7 +42,7 @@ public class TestStopwatch{
 		//If it gets to here without throwing an exception everything went well
 	}
 	@Test
-	public void testConversion(){
+	public void testConversion() throws InvalidResult{
 		Stopwatch timer = new Stopwatch();
 		Integer sum = 0;
 		//Start the timer
@@ -62,7 +64,7 @@ public class TestStopwatch{
 		assertEquals("Hour resolution test failed", timer.getHour(), (nano / 3600000000000D), ALLOWANCE);
 	}
 	@Test
-	public void testStringConversion(){
+	public void testStringConversion() throws InvalidResult{
 		//Test nanoseconds
 		String results = Stopwatch.getStr(1.0);
 		assertEquals("1.000 nanoseconds", results);