Done

ConversionTool.ctxt

@@ -0,0 +1,21 @@
+#BlueJ class context
+comment0.target=ConversionTool
+comment1.params=args
+comment1.target=void\ main(java.lang.String[])
+comment2.params=centimeters
+comment2.target=float\ CentimetersToInches(float)
+comment3.params=inches
+comment3.target=float\ InchesToCentimeters(float)
+comment4.params=feet
+comment4.target=float\ FeetToMeters(float)
+comment5.params=meters
+comment5.target=float\ MetersToFeet(float)
+comment6.params=celsius
+comment6.target=float\ CelsiusToFahrenheit(float)
+comment7.params=fahrenheit
+comment7.target=float\ FahrenheitToCelsius(float)
+comment8.params=mph
+comment8.target=float\ MphToKph(float)
+comment9.params=kph
+comment9.target=float\ KphToMph(float)
+numComments=10

ConversionTool.java

@@ -1,21 +1,75 @@
 public class ConversionTool {
 
+    public static void main(String[] args){
 
-    public static void main(String[] args){}
+    }
 
-    public static float CentimetersToInches(float centimeters){}
+    public static float CentimetersToInches(float centimeters){
+        if (centimeters >= 0){
+            centimeters = centimeters * (float) 0.393701;
 
-    public static float InchesToCentimeters(float inches){}
+        }else{
+            return 0;
+        }
+        return centimeters;
+    }
 
-    public static float FeetToMeters(float feet){}
+    public static float InchesToCentimeters(float inches){
+        if (inches >= 0){
+            inches = inches * (float)2.54;
+        }else{
+            return 0;
+        }
+        return inches;
+    }
 
-    public static float MetersToFeet(float meters){}
+    public static float FeetToMeters(float feet){
+        if (feet > 0){
+            feet = feet * (float)0.3048;
+        }else{
+            return 0;
+        }
+        return feet;
+    }
 
-    public static float CelsiusToFahrenheit(float celsius){}
+    public static float MetersToFeet(float meters){
+        if (meters > 0){
+            meters = meters * (float)3.28084;
+        }else{
+            return 0;
+        }
+        return meters;
+    }
 
-    public static float FahrenheitToCelsius(float fahrenheit){}
+    public static float CelsiusToFahrenheit(float celsius){
+        if(celsius >= 0){
+            celsius = (celsius) * (float)1.8 + 32;
+        }
+        return celsius;
+    }
 
-    public static float MphToKph(float mph){}
+    public static float FahrenheitToCelsius(float fahrenheit){
+        if (fahrenheit > 0){
+            fahrenheit = (fahrenheit - 32) / (float)(1.8); 
+        }
+        return fahrenheit;
+    }
 
-    public static float KphToMph(float kph){}
+    public static float MphToKph(float mph){
+        if(mph > 0){
+            mph = mph * (float)1.60934;
+        }else{
+            return 0;
+        }
+        return mph;
+    }
+
+    public static float KphToMph(float kph){
+        if(kph > 0){
+            kph = kph * (float)0.621371;
+        }else{
+            return 0;
+        }
+        return kph;
+    }
 }

ConversionToolSpec.ctxt

@@ -0,0 +1,43 @@
+#BlueJ class context
+comment0.target=ConversionToolSpec
+comment1.params=
+comment1.target=void\ shouldConvertCentimetersToInches()
+comment10.params=
+comment10.target=void\ shouldConvertMetersToFeet()
+comment11.params=
+comment11.target=void\ shouldConvertZeroMetersToZeroFeet()
+comment12.params=
+comment12.target=void\ shouldConvertNegativeMetersToZeroFeet()
+comment13.params=
+comment13.target=void\ shouldConvertFahrenheitToCelsius()
+comment14.params=
+comment14.target=void\ shouldConvertCelsiusToFahrenheit()
+comment15.params=
+comment15.target=void\ shouldConvertMphToKph()
+comment16.params=
+comment16.target=void\ shouldConvertZeroMphToZeroKph()
+comment17.params=
+comment17.target=void\ shouldConvertNegativeMphToZeroKph()
+comment18.params=
+comment18.target=void\ shouldConvertKphToMph()
+comment19.params=
+comment19.target=void\ shouldConvertZeroKphToZeroMph()
+comment2.params=
+comment2.target=void\ shouldConvertZeroCentimetersToZeroInches()
+comment20.params=
+comment20.target=void\ shouldConvertNegativeKphToZeroMph()
+comment3.params=
+comment3.target=void\ shouldConvertNegativeCentimetersToZeroInches()
+comment4.params=
+comment4.target=void\ shouldConvertInchesToCentimeters()
+comment5.params=
+comment5.target=void\ shouldConvertZeroInchesToZeroCentimeters()
+comment6.params=
+comment6.target=void\ shouldConvertNegativeInchesToZeroCentimeters()
+comment7.params=
+comment7.target=void\ shouldConvertFeetToMeters()
+comment8.params=
+comment8.target=void\ shouldConvertZeroFeetToZeroMeters()
+comment9.params=
+comment9.target=void\ shouldConvertNegativeFeetToZeroMeters()
+numComments=21