Learning Goal: I’m working on a java multi-part question and need an explanation and answer to help me learn.
1. Define a class named “Variable” that manages a variable name (string).
The class must at least provide the following methods:
– toString() method that can return a string in the following format:
variable-name
– contains() that accepts a search string and it will return true if its variable
name contains that string (case-insensitive) and false otherwise.
2. Define a class named “NumVar” that must inherit from the “Variable” class.
This class manages a variable name (string) and a number (integer).
It should not have the default constructor.
The class must at least provide the following methods:
– toString() method that can return a string in the following format:
variable-name(integer-value)
For example, the NumVar can be “Total(1000)”
3. Write a new class named “StrVar” that must inherit from the
“Variable” class. This class manages a variable name (string) and a
value (string).
The class must at least provide the following methods:
o toString() method that can return a string in the following format:
variable-name(variable-string-value).
For example, the StrVar can be “Desc(A box of candies)”
This class must override the “contains” method to search not only the variable name
but also within its description value.
4. Write a method named “contains” that accepts a vector of Variable objects and a search string. It will return the list of Variable objects that have the variable names containing that given search string (case-insensitive). In addition, it will also return the count of all the variable objects that
have the exact match (equal to the search string). Please note that the list can
contain Variable objects as well as any of its derived class
objects such as NumVar or StrVar objects. Please show how this method is called and returning proper values.
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