Define a public class named Dog with two instance variables: a double called age
and a String called name.
Provide a complete constructor that sets both fields with name as its first parameter.
Provide a getter and setter for age, and only a getter for name.
Your getters and setters should follow our naming convention: get or set followed by the name of the field,
capitalized.
Finally, reject negative ages values and null names using assert in the appropriate
places and before modifying any values.
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