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What are the four attributes that distinguish object-oriented programming? What are some advantages and disadvantages of OOP?
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Give three examples of primitive types and three examples of predefined Java classes (i.e., object types).
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What is the default constructor, and when is it called? What is a no-arg constructor?
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Describe overriding, and write some code to show an example.
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Consider the following three related classes:
class Mammal {}
class Dog extends Mammal { }
class Cat extends Mammal { }There are these variables of each class:
Mammal m;
Dog d = new Dog( );
Cat c = new Cat( );Which of these statements will cause an error at compile time, and why? Which of these statements may cause an error at run-time, and why?
m = d; // 1.
d = m; // 2.
d = (Dog) m; // 3.
d = c; // 4.
d = (Dog) c; // 5. -
Create a class that provides all the same methods as java.lang.Math, but which operate on degrees, not radians. Do this by creating a wrapper for each method in Math, in your class. Recall that a wrapper is a thin layer around a type or a method call to make some convenient adaptation, then call the underlying version.