@SuppressWarnings注解

@SuppressWarnings("unchecked") 是 Java 中的一个注解，用于在编译时抑制与未检查的类型转换相关的警告信息。

Annotation Type SuppressWarnings

public @interface SuppressWarnings

表示应在被注解的元素（以及被注解的元素中包含的所有程序元素）中抑制指定的编译器警告。请注意，给定元素中抑制的警告集是所有包含元素中抑制的警告集的超集。例如，如果您注解一个类以抑制一个警告，同时注解一个方法以抑制另一个警告，则这两个警告都会在该方法中被抑制。
Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element). Note that the set of warnings suppressed in a given element is a superset of the warnings suppressed in all containing elements. For example, if you annotate a class to suppress one warning and annotate a method to suppress another, both warnings will be suppressed in the method.

出于代码风格考虑，程序员应始终在最深层嵌套的元素上使用此注解（如果该注解有效）。如果您想在特定方法中抑制警告，则应该注解该方法，而不是其类。
As a matter of style, programmers should always use this annotation on the most deeply nested element where it is effective. If you want to suppress a warning in a particular method, you should annotate that method rather than its class.

public abstract String[] value

编译器将在注释元素中抑制的警告集合。允许重复的名称。名称的第二次及后续出现将被忽略。存在无法识别的警告名称并非错误：编译器必须忽略任何无法识别的警告名称。但是，如果注释包含无法识别的警告名称，编译器可以随意发出警告。
The set of warnings that are to be suppressed by the compiler in the annotated element. Duplicate names are permitted. The second and successive occurrences of a name are ignored. The presence of unrecognized warning names is not an error: Compilers must ignore any warning names they do not recognize. They are, however, free to emit a warning if an annotation contains an unrecognized warning name.

字符串“unchecked”用于抑制未经检查的警告。编译器供应商应记录他们支持与此注释类型结合的其他警告名称。鼓励他们合作，以确保相同的名称在多个编译器中都能正常工作。
The string "unchecked" is used to suppress unchecked warnings. Compiler vendors should document the additional warning names they support in conjunction with this annotation type. They are encouraged to cooperate to ensure that the same names work across multiple compilers.

Returns:
the set of warnings to be suppressed