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The Java™ Tutorials
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Numbers and Strings
Numbers
The Numbers Classes
Formatting Numeric Print Output
Beyond Basic Arithmetic
Summary of Numbers
Questions and Exercises
Characters
Strings
Converting Between Numbers and Strings
Manipulating Characters in a String
Comparing Strings and Portions of Strings
The StringBuilder Class
Summary of Characters and Strings
Autoboxing and Unboxing
Questions and Exercises
Trail: Learning the Java Language
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# Lesson: Numbers and Strings

## Numbers

This section begins with a discussion of the `Number` class (in the `java.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. Finally, there is a discussion on autoboxing and unboxing, a compiler feature that simplifies your code.

## 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 the `String` class to create and manipulate strings. It also compares the `String` and `StringBuilder` classes.

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