@SuppressWarnings注解用法
@SuppressWarnings注解主要用在取消一些編譯器產生的警告對代碼工具左側行列提示,但這種警告可以通過注釋類型聲明來取消
@SuppressWarnings常用的注解的使用有三種: 1. @SuppressWarnings("unchecked") [抑制沒有進行類型檢查操作的警告] 2. @SuppressWarnings("unchecked","rawtypes") [抑制多類型的警告] 3. @SuppressWarnings("unused") [抑制沒被使用過的代碼的警告] 通過源碼分析可知@SuppressWarnings其注解目標為類、字段、函數、函數入參、構造函數和函數的局部變量 下面列舉警告關鍵字:
all |
to suppress all warnings (抑制所有警告) |
boxing |
to suppress warnings relative to boxing/unboxing operations (抑制裝箱、拆箱操作時候的警告) |
cast |
to suppress warnings relative to cast operations (抑制映射相關的警告) |
dep-ann |
to suppress warnings relative to deprecated annotation (抑制啟用注釋的警告) |
deprecation |
to suppress warnings relative to deprecation (抑制過期方法警告) |
fallthrough |
to suppress warnings relative to missing breaks in switch statements (抑制確在switch中缺失breaks的警告) |
finally |
to suppress warnings relative to finally block that don’t return (抑制finally模塊沒有返回的警告) |
hiding |
to suppress warnings relative to locals that hide variable(抑制相對於隱藏變量的局部變量的警告) |
incomplete-switch |
to suppress warnings relative to missing entries in a switch statement (enum case)(忽略沒有完整的switch語句) |
nls |
to suppress warnings relative to non-nls string literals( 忽略非nls格式的字符) |
null |
to suppress warnings relative to null analysis( 忽略對null的操作) |
rawtypes |
to suppress warnings relative to un-specific types when using generics on class params( 使用generics時忽略沒有指定相應的類型) |
restriction |
to suppress warnings relative to usage of discouraged or forbidden references( 抑制禁止使用勸阻或禁止引用的警告) |
serial |
to suppress warnings relative to missing serialVersionUID field for a serializable class( 忽略在serializable類中沒有聲明serialVersionUID變量) |
static-access |
to suppress warnings relative to incorrect static access( 抑制不正確的靜態訪問方式警告) |
synthetic-access |
to suppress warnings relative to unoptimized access from inner classes( 抑制子類沒有按最優方法訪問內部類的警告) |
unchecked |
to suppress warnings relative to unchecked operations( 抑制沒有進行類型檢查操作的警告) |
unqualified-field-access |
to suppress warnings relative to field access unqualified( 抑制沒有權限訪問的域的警告) |
unused |
to suppress warnings relative to unused code( 抑制沒被使用過的代碼的警告) |