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

3.5 Account Class with a Balance; Floating-Point Numbers

We now declare an Account class that maintains the balance of a bank account in addition to the name. Most account balances are not integers. So, class Account represents the account balance as a floating-point number—a number with a decimal point, such as 43.95, 0.0, –129.8873. [In Chapter 8, we’ll begin representing monetary amounts precisely with class BigDecimal as you should do when writing industrial-strength monetary applications.]

Java provides two primitive types for storing floating-point numbers in memory—float and double. Variables of type float represent single-precision floating-point numbers and can hold up to seven significant digits. Variables of type double represent ...