Spring的註解@SuppressWarnings用法記錄

@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代碼左側行列的遮擋,有時候這會擋住咱們斷點調試時打的斷點。
如圖所示:

這時候咱們在方法上加上@SuppressWarnings註解就能夠消除這些警告的產生,註解的使用有三種:

1. @SuppressWarnings("unchecked")  [^ 抑制單類型的警告]
2. @SuppressWarnings("unchecked","rawtypes")  [^ 抑制多類型的警告]
3. @SuppressWarnings("unchecked")  [^ 抑制全部類型的警告]
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> 經過源碼分析可知@SuppressWarnings其註解目標爲類、字段、函數、函數入參、構造函數和函數的局部變量。建議把註解放在最近進警告發生的位置。
下面列舉警告關鍵字:
關鍵字 用途
all to suppress all warnings (抑制全部警告)
boxing to suppress warnings relative to boxing/unboxing operations (抑制裝箱、拆箱操做時候的警告)
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 (抑制啓用註釋的警告)
deprecation to suppress warnings relative to deprecation (抑制過時方法警告)
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的操做)
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做的警告)
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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