java注解 @SuppressWarnings注解用法


@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:
關鍵字 用途
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)


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