Write a public class Table that has 3 variables:
a String: wood, a double: width, and a double: height.
You should implement a constructor that initializes these three variables in that order,
rejecting null and zero/negative values. You should provide getters for all three variables.
You should also override .equals(), which should return true when two Tables have
the same area.
You're challenge is to write tests for this problem described above.
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