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An object is constructed by instantiating a class. The
process of creating an object of a class is called as instantiation and
the created object is called as an instance. To create a new object,
Java uses the new keyword. Figure 1.5 illustrates how you can
create an account object by instantiating the Account class.
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Figure 1.5 Creating an account instance with new keyword.
The nekeyword
followed by a call to the constructor method. In the example, Account(50) is a call to a constructor for the Account
class. In this call, the account object is created. The new
keyword returns a reference vcto this newly created Account object. You
can then store this reference into the account variable.
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Object’s methods are also called as instance methods and its variables as instance variables. Interestingly a class may define methods and variables, which belongs to a class rather than an object. Such methods and variables are called as static or class members. We will learn more about them in chapter 3. |
