Computer Science: Programming with a Purpose Week 9 Quiz Answer

In this article i am gone to share Coursera Course Computer Science: Programming with a Purpose Week 9 | Creating Data Types Quiz Answer with you..

Creating Data Types

Question 1)

Of the following, which best describes a class in Java?

Defines data type values
Implements a data type
Implements a test client
Creates and initializes new objects
Implements operations on data type values

Question 2)

What does a constructor return?

An object
Nothing (no return value)
A reference to an object
Instance variable values
A method that creates an object

Question 3)

What does an instance variable refer to in an instance method?

A value in the scope of the method
A value in the scope of the method's client
A value in the scope of the constructor associated with the method
A value associated with the object that was used to invoke the method
An object that was created by the constructor associated with the method

Question 4)

A shadow in a Java data type implementation refers to which of the following?

Two constructors with the same name
An instance method with the same name as a constructor
A local variable with the same name as an instance variable
An instance variable with the same name as a constructor
An instance method with the same name as a static method

Question 5)

Suppose you want to add a constructor to Complex that takes a double value as its argument and creates a Complex number with that value as the real part (and imaginary part equal to 0). You write the following code:

public void Complex(double real)

{

re = real;

im = 0.0;

}

But then the statement Complex C = new Complex(1.0) does not compile. Why?

The types of re and im are not declared.
A class can only have one constructor.
Constructors do not have return types, not even void.
The return type should be complex, not void.
None of the above.

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