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@SuppressWarnings

时间:2019-05-20 13:35:55      阅读:120      评论:0      收藏:0      [点我收藏+]

标签:lang   告诉   名称   不用   UNC   using   enc   text   信息   

简介:java.lang.SuppressWarnings是J2SE 5.0中标准的Annotation之一。可以标注在类、字段、方法、参数、构造方法,以及局部变量上。
作用:告诉编译器忽略指定的警告,不用在编译完成后出现警告信息。
使用:
@SuppressWarnings(“”)
@SuppressWarnings({})
@SuppressWarnings(value={})
根据sun的官方文档描述:
value - 将由编译器在注释的元素中取消显示的警告集。允许使用重复的名称。忽略第二个和后面出现的名称。出现未被识别的警告名不是 错误:编译器必须忽略无法识别的所有警告名。但如果某个注释包含未被识别的警告名,那么编译器可以随意发出一个警告。
各编译器供应商应该将它们所支持的警告名连同注释类型一起记录。鼓励各供应商之间相互合作,确保在多个编译器中使用相同的名称。
示例1——抑制单类型的警告:
@SuppressWarnings("unchecked")
public void addItems(String item){
  @SuppressWarnings("rawtypes")
   List items = new ArrayList();
   items.add(item);
}

  示例2——抑制多类型的警告:

@SuppressWarnings(value={"unchecked", "rawtypes"})
public void addItems(String item){
   List items = new ArrayList();
   items.add(item);
}

 示例3——抑制所有类型的警告:

@SuppressWarnings("all")
public void addItems(String item){
   List items = new ArrayList();
   items.add(item);
}

  抑制警告的关键字

关键字 用途
all to suppress all warnings
boxing  to suppress warnings relative to boxing/unboxing operations
cast to suppress warnings relative to cast operations
dep-ann to suppress warnings relative to deprecated annotation
deprecation to suppress warnings relative to deprecation
fallthrough  to suppress warnings relative to missing breaks in switch statements
finally  to suppress warnings relative to finally block that don’t return
hiding to suppress warnings relative to locals that hide variable
incomplete-switch  to suppress warnings relative to missing entries in a switch statement (enum case)
nls  to suppress warnings relative to non-nls string literals
null to suppress warnings relative to null analysis
rawtypes to suppress warnings relative to un-specific types when using generics on class params
restriction to suppress warnings relative to usage of discouraged or forbidden references
serial to suppress warnings relative to missing serialVersionUID field for a serializable class
static-access o suppress warnings relative to incorrect static access
synthetic-access   to suppress warnings relative to unoptimized access from inner classes
unchecked  to suppress warnings relative to unchecked operations
unqualified-field-access to suppress warnings relative to field access unqualified
unused to suppress warnings relative to unused code

reference : 

https://www.cnblogs.com/fsjohnhuang/p/4040785.html

https://blog.csdn.net/xiehuanhuan1991/article/details/79615960

 

@SuppressWarnings

标签:lang   告诉   名称   不用   UNC   using   enc   text   信息   

原文地址:https://www.cnblogs.com/tben/p/10893546.html

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