Using classes without importing them most classes need to, Basic Computer Science

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Using classes without importing them most classes need to

1. (Keyword new) What's the purpose of keyword new? Explain what happens when you use it.

2. (Default Constructors) What is a default constructor? How are an object's instance variables initialized if a class has only a default constructor?

3. (Instance Variables) Explain the purpose of an instance variable.

4. (Using Classes without Importing Them) Most classes need to be imported before they can be used in an app. Why is every app allowed to use classes System and String without first importing them?

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