Java™ How To Program (Early Objects), Tenth Edition

3.5.1 Account Class with a balance Instance Variable of Type double

Our next app contains a version of class Account (Fig. 3.8) that maintains as instance variables the name and the balance of a bank account. A typical bank services many accounts, each with its own balance, so line 8 declares an instance variable balance of type double. Every instance (i.e., object) of class Account contains its own copies of both the name and the balance.

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 1   // Fig. 3.8: Account.java 2   // Account class with a double instance variable balance and a constructor 3   // and deposit method that perform validation. 4  5   public class Account 6   { 7      private String name; // instance variable 8      private double balance; ...