Using Wrappers

• The wrapper classes correlate to the primitive types.
• Wrappers have two main functions:
• To wrap primitives so that they can be handled like objects
• To provide utility methods for primitives (usually conversions)
• The three most important method families are
• xxxValue() Takes no arguments, returns a primitive
• parseXxx() Takes a String, returns a primitive, throws NFE
• valueOf() Takes a String, returns a wrapped object, throws NFE
• Wrapper constructors can take a String or a primitive, except for Character, which can only take a char.
• Radix refers to bases (typically) other than 10; octal is radix = 8, hex = 16.