Added a Stopwatch class and tests to make sure it works propperly

testStopwatch.java

@@ -0,0 +1,67 @@
+//Java/JavaClasses/testStopwatch.java
+//Matthew Ellison
+// Created: 03-01-19
+//Modified: 03-01-19
+//This class is used to test that stopwatch does what it is supposed to do (approximately)
+
+
+import mattrixwv.Stopwatch;
+
+
+public class testStopwatch{
+	private static final int NUM_TO_RUN = 100000;
+    public static void main(String[] argv){
+		Boolean failed = false;	//A flag to determine if all tests were passed
+		//Print the test begin message
+		System.out.println("Begin test");
+		//Describe which test is being performed
+		System.out.println("Starting loop");
+		//Start the timer
+		Stopwatch timer = new Stopwatch();
+		timer.start();
+		for(int cnt = 0;cnt < NUM_TO_RUN;++cnt){
+			System.out.print(cnt);
+		}
+		//Stop the timer
+		timer.stop();
+		System.out.println("\nLoop completed");
+
+		//Check that the different resolutions work out correctly
+		System.out.println("Checking that resolutions line up correctly");
+		Double nano = timer.getNano();
+		if(timer.getMicro() != (nano.doubleValue() / 1000D)){
+			System.out.println("Error on microsecond resolution");
+			failed = true;
+		}
+		else if(timer.getMilli() != (nano.doubleValue() / 1000000D)){
+			System.out.println("Error on millisecond resolution");
+			failed = true;
+		}
+		else if(timer.getSecond() != (nano.doubleValue() / 1000000000D)){
+			System.out.println("Error on second resolution");
+			failed = true;
+		}
+		else if(timer.getMinute() != (nano.doubleValue() / 60000000000D)){
+			System.out.println("Error on minute resolution");
+			failed = true;
+		}
+		else if(timer.getHour() != (nano.doubleValue() / 3600000000000D)){
+			System.out.println("Error on hour resolution");
+			failed = true;
+		}
+		else{
+			System.out.println("All time resolution tests completed successfully");
+		}
+		System.out.println("Completed resolution checking");
+
+		//Print the results
+		System.out.printf("The timer results in: %s\n", timer.getStr());
+
+		if(!failed){
+			System.out.println("All tests completed successfully");
+		}
+		else{
+			System.out.println("Test failed. Try again!");
+		}
+    }
+}