而引起内部values值的改变,返回的是原数组的副本publicstaticColor[]values(){return(Color[])$VALUES.clone();}// 按名字获取枚举实例publicstaticColorvalueOf(String name){return(Color)Enum.valueOf(em/Color,name);}// 私有的构造函数privateC
我们可以到jackson官网上下源代码跟进去看看,最终定位到枚举处理类EnumValues。 是否忽略注解的差异在该类的constructFromName(Class<Enum<?>> enumClass, AnnotationIntrospector intr)方法 public static EnumValues constructFromName(Class<Enum<?>> enumClass, AnnotationIntrospector intr) { /* [JACKSON-214]: Enum...
默认情况下,Jackson会将Java Enums表现为一个简单的字符串。比如说: new ObjectMapper().writeValueAsString(Distance.MILE); 1. 将导致: "MILE" 1. 但是,当将此 Enum 编组为 JSON 对象时,我们希望得到如下内容: {"unit":"miles","meters":1609.34} 1. 枚举作为 JSON 对象 从Jackson 2.1.2 开始,现在有...
为什么我们在创建的enum类里可以直接访问 values() 或 valueOf(String) 方法呢? 从上面的字节码源码可以看出来,这2个方法是 java编译器 给加上的。换句话说,在 Java 中,所有的枚举类型都是继承自java.lang.Enum类。Java编译器在编译Enum类时,会生成一些方法,其中包括values()和valueOf(String name)方法。因为...
enumSize { SMALL, MEDIUM, LARGE, EXTRALARGE }classMain{publicstaticvoidmain(String[] args){ System.out.println(Size.SMALL); System.out.println(Size.MEDIUM); } } Output SMALL MEDIUM As we can see from the above example, we use the enum name to access the constant values. ...
StdDeserializer<Enum<?>> { public EnumDeserializer() { super(Enum.class); } @Override public Enum<?> deserialize(JsonParser p, DeserializationContext ctxt) throws IOException { String value = p.getValueAsString(); Class<? extends Enum<?>> enumClass = (Class<? extends Enum<?>>) handled...
$VALUES.clone();}publicstaticSingletonvalueOf(java.lang.Stringname){return(Singleton)java.lang.Enum...
enum Weekday { Mon("Monday"), ... static Optional<Weekday> byNameIgnoreCase(String givenName) { return Arrays.stream(values()).filter(it -> it.name().equalsIgnoreCase(givenName)).findAny(); } static Optional<Weekday> byFullNameIgnoreCase(String givenFullName) { ...
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 : Season.values()) { ...
Understanding Enums and Values in Java Applying Enums with Values in Larger Projects Wrapping Up: Mastering Java Enums with Values Defining and Using Enums with Values in Java Enums in Java are a type of class that have a fixed number of instances. These instances, also known as constants...