数字和字符串

This part of the tutorial covers numbers with primitive types and wrapper classes, and string of characters.

1. Numbers
   

   Using numbers with primitive types and wrapper types, formatting numbers and using mathematical functions.

2. Characters
   

   Using characters, understanding char values and code point values.

3. Strings
   

   Creating strings of characters, exploring the String class to manipulate strings.

4. String Builders
   

   Using string builders to create strings of characters.

5. Autoboxing and Unboxing
   

   Understanding the automatic conversion between primitive types and their corresponding wrapper types.

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