@SuppressWarnings注解大白话大全
下文笔者讲述@SuppressWarnings注解的功能大全，如下所示
@SuppressWarnings注解的功能
@SuppressWarnings注解的功能 屏蔽一些错误警告 @SuppressWarnings注解不是指代码错误 而此注解可提高代码的安全性 防止为了解决这个错误警告而造成不可估量的后果
@SuppressWarnings注解的源码
@Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE})
@Retention(RetentionPolicy.SOURCE)
public @interface SuppressWarnings {
/**
* 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 <i>not</i> 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.
*
* <p> The string {@code "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.
* @return the set of warnings to be suppressed
*/
String[] value();
}
抑制警告值
| 值 | 功能 |
| all | to suppress all warnings （抑制所有警告） |
| boxing | to suppress warnings relative to boxing/unboxing operations （抑制装箱、拆箱操作时候的警告） |
| cast | to suppress warnings relative to cast operations （抑制映射相关的警告） |
| dep-ann | to suppress warnings relative to deprecated annotation （抑制启用注释的警告） |
| deprecation | to suppress warnings relative to deprecation （抑制过期方法警告） |
| fallthrough | to suppress warnings relative to missing breaks in switch statements （抑制确在switch中缺失breaks的警告） |
| finally | to suppress warnings relative to finally block that don’t return （抑制finally模块没有返回的警告） |
| hiding | to suppress warnings relative to locals that hide variable（抑制相对于隐藏变量的局部变量的警告） |
| incomplete-switch | to suppress warnings relative to missing entries in a switch statement (enum case)（忽略没有完整的switch语句） |
| 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（ 忽略对null的操作） |
| rawtypes | to suppress warnings relative to un-specific types when using generics on class params（ 使用generics时忽略没有指定相应的类型） |
| restriction | to suppress warnings relative to usage of discouraged or forbidden references（ 抑制禁止使用劝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类中没有声明serialVersionUID变量） |
| static-access | to suppress warnings relative to incorrect static access（ 抑制不正确的静态访问方式警告） |
| synthetic-access | to suppress warnings relative to unoptimized access from inner classes（ 抑制子类没有按最优方法访问内部类的警告） |
| unchecked | to suppress warnings relative to unchecked operations（ 抑制没有进行类型检查操作的警告） |
| unqualified-field-access | to suppress warnings relative to field access unqualified（ 抑制没有权限访问的域的警告） |
| unused | to suppress warnings relative to unused code（ 抑制没被使用过的代码的警告） |
常见的SupperssWarning用法
@SuppressWarnings("unchecked") 抑制单类型的警告
@SuppressWarnings({"unchecked", "deprecated"}) 抑制多类型的警告
@SuppressWarnings("all") 抑制所有类型的警告
deprecation 告诉编译器忽略过时的方法或类型检查
例
@SuppressWarnings("all")
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserTest {
//定义StudentMapper
@Autowired
private UserMapper userDao;
@Test
public void testInsertStudent() {
User user = new User();
user.setName("猫猫");
user.setEmail("java265.com");
user.setAge(22);
int rows = userDao.insert(user);
System.out.println("inserStudent rows:" + rows);
}
}
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