java註解 @SuppressWarnings註解用法
阿新 • • 發佈:2019-01-12
@SuppressWarnings註解用法
@SuppressWarnings註解主要用在取消一些編譯器產生的警告對程式碼工具左側行列提示,但這種警告可以通過註釋型別宣告來取消
@SuppressWarnings常用的註解的使用有三種:
1. @SuppressWarnings("unchecked") [抑制沒有進行型別檢查操作的警告]
2. @SuppressWarnings("unchecked","rawtypes") [抑制多型別的警告] 3. @SuppressWarnings("unused") [抑制沒被使用過的程式碼的警告] 通過原始碼分析可知@SuppressWarnings其註解目標為類、欄位、函式、函式入參、建構函式和函式的區域性變數 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 (抑制對映相關的警告) |
dep-ann | to suppress warnings relative to deprecated annotation (抑制啟用註釋的警告) |
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模組沒有返回的警告) |
hiding | to suppress warnings relative to locals that hide variable(抑制相對於隱藏變數的區域性變數的警告) |
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格式的字元) |
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型別) |
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類中沒有宣告serialVersionUID變數) |
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( 抑制沒有進行型別檢查操作的警告) |
unqualified-field-access | to suppress warnings relative to field access unqualified( 抑制沒有許可權訪問的域的警告) |
unused | to suppress warnings relative to unused code( 抑制沒被使用過的程式碼的警告) |