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