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Answer and Explanation

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Housekeeping material
  • Module name: Ap0100: Self-assessment, The this keyword, static final variables, and initialization of instance variables
  • File: Ap0100.htm
  • Originally published: 2004
  • Published at cnx.org: 12/08/12
  • Revised: 12/03/14
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Answers

Answer 10

C. 20 222.0 false --- 5 222.0 true

Explanation 10

Four ways to initialize instance variables

There are at least four ways to establish initial values for instance variables (you may be able to think of others) :

  1. Allow them to take on their default values.
  2. Establish their values using initialization expressions.
  3. Establish their values using hard-coded values within a constructor.
  4. Establish their values using parameter values passed to parameterized constructors.

Using the first two ways

The following fragment illustrates the first two of those four ways.

class Worker{ private int myInt = 100;private double myDouble = 222.0; private boolean myBoolean;//...

In the above fragment, the instance variables named myInt and myDouble receive their initial values from initialization expressions. In these twocases, the initialization expressions are very simple. They are simply literal expressions. However, they could be much more complex if needed.

The variable named myBoolean in the above fragment is allowed to take on its default value of false.

Replacing the default noarg constructor

The next fragment shows one of the two overloaded constructors in the class named Worker . This constructor is a replacement for the default noarg constructor.

Questions & Answers

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