泛型中占位符T和?的区别
public static <T> void show1(List<T> list){ for (Object object : list) { System.out.println(object.toString()); } } public static void show2(List<?> list) { for (Object object : list) { System.out.println(object); …
10 2021-02-25 0 阅读更多自定义Valida验证注解
自定义注解 @Target({ElementType.METHOD,ElementType.FIELD}) //注解作用域 @Retention(RetentionPolicy.RUNTIME) //注解作用时间 @Constraint(validatedBy = MyConstriantValidator.class) //执行校验逻辑的类 public @interface MyConstraint {//校验不过时候的…
49 2021-02-22 0 阅读更多