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Foreword
Number is an abstract class, the class is Numeric Byte, superclass Short, Integer, Long, Float, Double, BigInteger, BigDecimal is (there are several classes under java.util.concurrent.atomic package regardless of being the first).
Number abstract class above in order to allow a few to inherit.
First, outline
- Parent class: java.lang.Object
- Implement an interface: Serializable
public abstract class Number extends Object implements Serializable
Second, the common method
1. speaking with several methods
byteValue()、doubleValue()、floatValue() 、intValue() 、longValue() 、shortValue()
- I understood that: Several methods above are just the same as it does not return a value, such as o byteValue () method returns a byte, doubleValue in () returns a double type, several other so on. Role Well, that is return to the basic data types, subclass inherits the time easy to use.
- Returns: Returns the value of several basic data type representations
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