Javadoc: NumberFormat (easyexcel 2.1.4 API)

```
@Target(value=FIELD)
 @Retention(value=RUNTIME)
 @Inherited
public @interface NumberFormat
```
Convert number format.
write: It can be used on classes that inherit Number

read: It can be used on classes String

作者:

Jiaju Zhuang

- 可选元素概要
  
  可选元素
  
  限定符和类型可选元素和说明
  
  RoundingMode roundingMode
  Rounded by default
  
  String value
  Specific format reference DecimalFormat

- 元素详细资料
  - value
```
public abstract String value
```
    Specific format reference DecimalFormat
    
    返回:
    
    Format pattern
    
    默认值:
    
    ""
- - roundingMode
```
public abstract RoundingMode roundingMode
```
    Rounded by default
    
    返回:
    
    RoundingMode
    
    默认值:
    
    java.math.RoundingMode.HALF_UP

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