Introduction: Using Classes and Objects
We introduce this chapter by providing the prerequisites, learning objectives, and overview.
We'll cover the following
Prerequisites
Objectives
After completing this chapter, you should be able to
- Describe how a variable of a primitive type differs from a variable of a class type in the way they represent data
- Use the operator
new
to create an object - Use methods within the class
String
to manipulate strings - Use the class
Scanner
to extract portions of a string - Use the class
Date
to create and compare twoDate
objects - Use the class
BigDecimal
to perform decimal arithmetic - Use a wrapper class such as
Integer
to represent primitive data as an object - Use the method
parseInt
in the classInteger
to convert a string containing an integer to anint
- Use constants in the class
Integer
to discover the minimum and maximum values of anint
- Use the class
Random
to generate random numbers - Use the class
DecimalFormat
to format numerical output
Overview
Our first chapter introduced the notion of an object, but in this chapter, we will look at the concept in detail. We will introduce several classes that are standard in the Java Class Library and show you how to use them. Our goal is to familiarize you with objects and their behaviors.
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