Aggiunti alcuni esercizi di java.

cars-assemble/HINTS.md

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+# Hints
+
+## General
+
+- [Numbers tutorial][numbers].
+
+## 1. Calculate the production rate per second
+
+- Determining the success rate can be done through a [conditional statement][if-statement].
+- Java allows for multiplication to be applied to two different number types (such as an `int` and a `double`). It will automatically return the "broader" data type.
+- Numbers can be compared using the built-in [comparison][comparison-operators] and [equality operators][comparison-operators].
+
+## 2. Calculate the number of working items produced per second
+
+- Whereas an `int` can be automatically converted to a `double`, the reverse does not hold. The reason for this is that an `int` has less precision than a `double` so rounding has to be applied, also the range of numbers an `int` can represent is smaller than a `double`. To force this conversion you can use a [cast to an int][cast-int].
+
+[cast-int]: https://www.w3schools.com/java/java_type_casting.asp
+[numbers]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
+[if-statement]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html
+[comparison-operators]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op2.html