Compare and contrast abstract classes and interfaces.
What will be an ideal response?
Abstract classes and interfaces are similar in that you cannot instantiate concrete objects from either one. Abstract classes differ from interfaces because abstract classes can contain nonabstract methods, but all methods within an interface must be abstract. A class can inherit from only one abstract superclass, but it can implement any number of interfaces.
Computer Science & Information Technology
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Computer Science & Information Technology
Which of the following is not a valid Java identifier?
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Computer Science & Information Technology