关键字用途
allto suppress all warnings
boxing to suppress warnings relative to boxing/unboxing operations
castto suppress warnings relative to cast operations
dep-annto suppress warnings relative to deprecated annotation
deprecationto suppress warnings relative to deprecation
fallthrough to suppress warnings relative to missing breaks in switch statements
finally to suppress warnings relative to finally block that don’t return
hidingto suppress warnings relative to locals that hide variable
incomplete-switch to suppress warnings relative to missing entries in a switch statement (enum case)
nls to suppress warnings relative to non-nls string literals
nullto suppress warnings relative to null analysis
rawtypesto suppress warnings relative to un-specific types when using generics on class params
restrictionto suppress warnings relative to usage of discouraged or forbidden references
serialto suppress warnings relative to missing serialVersionUID field for a serializable class
static-accesso suppress warnings relative to incorrect static access
synthetic-access  to suppress warnings relative to unoptimized access from inner classes
unchecked to suppress warnings relative to unchecked operations
unqualified-field-accessto suppress warnings relative to field access unqualified
unusedto suppress warnings relative to unused code