In Java, you can assign values to enums by defining a constructor and a private variable in the enum. For example an enum for Seasons of the year will have 4 constants:public enum Season {WINTER, SPRING, SUMMER, FALL}. This allows you to associate specific values with each enum constant...
1. How to Create Enum with Multiple Values The syntax to create anenumwith multiple values is very similar to the syntax ofenumwith a single value assigned to it. we should do the following steps to have anenum with different values: Createenum constructorwhich accepts multiple values Assignea...
In thisguide to Javaenumwith string values, learn tocreate enum using strings, iterate over all enum values, get enum value and perform a reverse lookup tofind an enum by stringparameter. We should always createenumwhen we have a fixed set of related constants.Enums are inherently singleton,...
publicstaticSexEnum getSexEnumByCode(String code){for(SexEnum sexEnum : SexEnum.values()){if(StringUtils.equals(code, sexEnum.getCode())){returnsexEnum; } }returnnull; } 以这种方案实现时,需要在每个枚举类中都定义类似上述结构的方法。当项目中的枚举类较多时,显得代码冗余。 2.利用反射实现 首...
Let’s modify the ‘Day’ enum we used earlier and add a feature that assigns a type to each day — weekdays or weekends. This new feature can be implemented using Java enum with values. Here’s how you can do it: public enum Day { ...
values() 返回枚举类的所有常量; ordinal() 返回枚举常量的序号 valueOf(String name) 返回名为name的枚举常量,如果存在。 //演示 values(), ordinal() 和 valueOf() 方法enumColor { RED, GREEN, BLUE; }publicclassTest {publicstaticvoidmain(String[] args) ...
Below is a state diagram representing theColorenum with its three constants: RED, GREEN, and BLUE. REDGREENBLUE Conclusion In Java, enums provide a convenient way to define a set of constants. By implementing a method that maps keys to enum values, we can easily retrieve enum constants base...
("Red") APPLE, @Color("Yellow") BANANA, @Color("Green") PEAR } public class EnumWithAnnotationExample { public static void main(String[] args) { // 遍历枚举常量,获取注解信息 for (Fruit fruit : Fruit.values()) { Color colorAnnotation = fruit.getClass().getDeclaredField(fruit.name())...
In Java, an enum (short for enumeration) is a type that has a fixed set of constant values. We use the enum keyword to declare enums. For example, enum Size { SMALL, MEDIUM, LARGE, EXTRALARGE } Here, we have created an enum named Size. It contains fixed values SMALL, MEDIUM, ...
答:可以使用startsWith()判断字符串是否以特定的前缀开头,使用endsWith()判断字符串是否以特定的后缀结尾。 8.问:如何将字符串拆分成数组或将数组拼接成字符串? 答:可以使用split()方法将字符串拆分成数组,使用join()方法将数组拼接成字符串。 9.问:如何去除字符串中...