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Number Cube

Make a new class (Object) called Di or NumberCube
Make have 2 instance variables: the total number of sides, and the side currently facing up
Make a default Constructor with no parameters that initializes the instance variables
Make a roll method that randomly changes the current side facing up. It should return an int
```
 return 1 + (int)(sides*Math.random() ) ;
```
Override the default toString() method so it returns a string reporting the number facing up and how many sides it has