Java消除泛型警告

怼烎@ 2022-08-04 19:28 205阅读 0赞

在泛型前面加入 @SuppressWarnings("unchecked") 可以消除泛型警告

主要是在强制转换时出现警告

例如：

@SuppressWarnings("unchecked")  
ArrayList<Object> stus = (ArrayList<Object>)request.getAttribute("stus");

泛型参数表

<table style="width:569px;"> 
 <tbody> 
  <tr> 
   <td style="width:100px;">属 性</td> 
   <td style="width:248px;">英文</td> 
   <td style="width:219px;">中文</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>all</code></td> 
   <td style="width:248px;">to suppress all warnings</td> 
   <td style="width:219px;">抑制所有警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>boxing</code></td> 
   <td style="width:248px;">to suppress warnings relative to boxing/unboxing operations</td> 
   <td style="width:219px;">抑制装箱、拆箱操作时候的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>cast</code></td> 
   <td style="width:248px;">to suppress warnings relative to cast operations</td> 
   <td style="width:219px;">抑制映射相关的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>dep-ann</code></td> 
   <td style="width:248px;">to suppress warnings relative to deprecated annotation</td> 
   <td style="width:219px;">抑制启用注释的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>deprecation</code></td> 
   <td style="width:248px;">to suppress warnings relative to deprecation</td> 
   <td style="width:219px;">抑制过期方法警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>fallthrough</code></td> 
   <td style="width:248px;">to suppress warnings relative to missing breaks in switch statements</td> 
   <td style="width:219px;">抑制确在switch中缺失breaks的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>finally</code></td> 
   <td style="width:248px;">to suppress warnings relative to finally block that don’t return</td> 
   <td style="width:219px;">抑制finally模块没有返回的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>hiding</code></td> 
   <td style="width:248px;">to suppress warnings relative to locals that hide variable</td> 
   <td style="width:219px;">隐藏以抑制相对于隐藏变量的局部变量的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>incomplete-switch</code></td> 
   <td style="width:248px;">to suppress warnings relative to missing entries in a switch statement</td> 
   <td style="width:219px;">忽略没有完整的switch语句</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>nls</code></td> 
   <td style="width:248px;">to suppress warnings relative to non-nls string literals</td> 
   <td style="width:219px;">忽略非nls格式的字符</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>null</code></td> 
   <td style="width:248px;">to suppress warnings relative to null analysis</td> 
   <td style="width:219px;">忽略对null的操作</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>rawtypes</code></td> 
   <td style="width:248px;">to suppress warnings relative to un-specific types when using generics on class params</td> 
   <td style="width:219px;">使用generics时忽略没有指定相应的类型</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>restriction</code></td> 
   <td style="width:248px;">to suppress warnings relative to usage of discouraged or forbidden references</td> 
   <td style="width:219px;">抑制与不鼓励或禁止引用的使用有关的警告的限制</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>serial</code></td> 
   <td style="width:248px;">to suppress warnings relative to missing serialVersionUID field for a serializable class</td> 
   <td style="width:219px;">略在serializable类中没有声明serialVersionUID变量</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>static-access</code></td> 
   <td style="width:248px;">&nbsp;to suppress warnings relative to incorrect static access</td> 
   <td style="width:219px;">抑制不正确的静态访问方式警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>synthetic-access</code></td> 
   <td style="width:248px;">to suppress warnings relative to unoptimized access from inner classes</td> 
   <td style="width:219px;">抑制子类没有按最优方法访问内部类的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>unchecked</code>&nbsp;</td> 
   <td style="width:248px;">to suppress warnings relative to unchecked operations</td> 
   <td style="width:219px;">抑制没有进行类型检查操作的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>unqualified-field-access</code></td> 
   <td style="width:248px;">to suppress warnings relative to field access unqualified</td> 
   <td style="width:219px;">抑制没有权限访问的域的警告</td> 
  </tr> 
  <tr> 
   <td style="width:100px;"><code>unused</code></td> 
   <td style="width:248px;">to suppress warnings relative to unused code</td> 
   <td style="width:219px;">抑制没被使用过的代码的警告</td> 
  </tr> 
 </tbody> 
</table>