Are Enum classes in Kotlin “expensive” for Android as Java?. Is it still stand to use @IntDefs or @StringDefs in Kotlin?. When I decompile Kotlin Enum class to Java class, there still used Java Enums in the low level, which are not recommended for use in Android Development, and this made me think…
Tag: enums
I have an enum, but i dont know how can I use correctly?
I searched so long for what enums are useful. In my Opinion there are Variables with many keywords. So have to programming a program what Is used to manage a bank. My Enum has 2 Variables EINZAHLUNG(Deposit) and AUSZAHLUNG(Payout). So I have an class Menue which is provide to call the Methods. The menue would…
Get Values of variables under an Enum
I want to write into a file/print the constants of an enum, as well as the values of their variables. For example, here is what I thought of doing: However, I am not fully sure on how to do such a thing, as I only recently began working with reflection. This is the code that I currently have. Here is
DBUnit PostgresqlDataTypeFactory does not recognizes enum list
I’m using DBUnit for an integration test, and before executing the test code I’m running into this error: the column that is ignored is a list of enums. In the dataset it’s written like this : I looked in the DBUnit FAQ and saw this issue , that says that I have to override the isEnumType() …
UML modelling enumeration with attributes
I would like to create an UML diagram with Java enumerations (enum), that have one or more attributes, but I am confused about how to do it. For example an enum could be declared like this: Without the attributes, it is easy: But how do you model it with attributes elegantly? Should it be like this? I found o…
Does proguard converts all enums to int or needs to be configured for this
Does proguard automatically converts enums to integer for memory optimization or I have to configure it to do this? If I do have to configure what is the configuration? Answer The optimization is listed on ProGuard’s optimizations page. It appears to be one of the default optimizations, but it (like oth…
Case-insensitive matching of a string to a Java enum
Java provides a valueOf() method for every Enum<T> object, so given an enum like one can do a lookup like If the string passed to valueOf() does not match (case sensitive) an existing Day value, an IllegalArgumentException is thrown. To do a case-insensitive matching, one can write a custom method insid…
Hibernate mapping between PostgreSQL enum and Java enum
Background Spring 3.x, JPA 2.0, Hibernate 4.x, Postgresql 9.x. Working on a Hibernate mapped class with an enum property that I want to map to a Postgresql enum. Problem Querying with a where clause on the enum column throws an exception. Code (heavily simplified) SQL: Hibernate mapped class: Java that calls …
Why do static and instance init blocks in Enums behave differently from those in Classes
In studying for the Java certification test I learned that static initialization blocks run once when the class is loaded, in order of appearance within the source code, that instance initialization blocks run each time an instance is created, and that code in constructors runs each time an instance is create…
Creating a Java Enum in Scala
My workplace has been experimenting in moving from Java to Scala for some tasks, and it works well for what we’re doing. However, some preexisting logging methods expect a java.lang.Enum. The logging method is defined in the (Java) base class, and the subclasses can define their own enums, which the log…