Numbers
This section begins with a discussion of theNumber
class (in thejava.lang
package) and its subclasses. In particular, this section talks about the situations where you would use instantiations of these classes rather than the primitive data types. Additionally, this section talks about other classes you might need to work with numbers, such as formatting or using mathematical functions to complement the operators built into the language.Strings
Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects. This section describes using theString
class to create and manipulate strings. It also compares theString
andStringBuilder
classes.