name()方法与toString()几乎是等同的,都是输出变量的字符串形式。至于valueOf(Class<T> enumType, String name)方法则是根据枚举类的Class对象和枚举名称获取枚举常量,注意该方法是静态的,在枚举单例时会用到。 三、枚举实现接口demo 由于枚举类型默认继承Enum抽象类,由于java语言的单继承特性,因此枚举类型无法再继...
public static final String FACTORIES_RESOURCE_LOCATION = "META-INF/spring.factories";// spring.factories文件的格式为:key=value1,value2,value3// 从所有的jar包中找到META-INF/spring.factories文件// 然后从文件中解析出key=factoryClass类名称的所有value值public static List<String> loadFactoryNames(Class<...
It is possible to give some values to the enumeration constants. Main.java enum Season { SPRING(10), SUMMER(20), AUTUMN(30), WINTER(40); private int value; Season(int value) { this.value = value; } public int getValue() { return value; } } void main() { for (Season season : ...
ENUM1, ENUM2, ... ;privateintfield ...;privateName(...) {...} } 各种enum都是Enum的子类,enum中的类型的toString会返回这种类型的名字,Enum.valueOf会将对应名字的类型返回来。 名字与enum的转换 Name.ENUM1.toString();//"ENUM1"Enum.valueOf(Name.class, "ENUM2");//enum with type ENUM2 N...
* enum constants, in line with JLS 9.7.4. * * For example, this {@code@Target} meta-annotation indicates that the * declared type is itself a meta-annotation type. It can only be used on * annotation type declarations: * * @Target(...
When a double must be used as a source for a BigDecimal, note that this constructor provides an exact conversion; it does not give the same result as converting the double to a String using the Double.toString(double) method and then using the BigDecimal(String) constructor. To get that re...
对属性值的解析是在BeanDefinitionValueResolver类中的resolveValueIfNecessary方法中进行的,对属性值的依赖注入是通过bw.setPropertyValues方法实现的,在分析属性值的依赖注入之前,我们先分析一下对属性值的解析过程。 1.2. BeanDefinitionValueResolver解析属性值 当容器在对属性进行依赖注入时,如果发现属性值需要进行类型转换...
When required functions are statically linked to the shared library, certain imported functions may introduce vulnerabilities over the lifetime of the application, which could give attackers the opportunity to modify the control flow or affect the application’s integrity in other ways. Consider the pr...
enum A Java keyword used to declare an enumerated type. enumerated type A type whose legal values consist of a fixed set of constants. exception An event during program execution that prevents the program from continuing normally; generally, an error. The Java programming language supports exception...
TheTYPE_USEconstant includes class and interface declarations and type parameter declarations as a convenience for designers of type checkers which give semantics to annotation interfaces. For example, if the annotation interfaceNonNullis meta-annotated with@Target(ElementType.TYPE_USE), then@NonNullclass...