![]() As a result, they are still null during the execution of the second initializer block. You should note that even though we pass the value of married and alive as true during instantiation, these properties only become true when the code within the second secondary constructor is executed. This time, the second secondary constructor invokes the first secondary constructor, which in turn invokes the primary constructor. When we instantiate the second Person "Alex", we go through the same process. Since initializer blocks are part of the primary constructor, they are executed next, and they are executed in the order in which we defined them. The secondary constructor definition with three parameters invokes the primary constructor with this(name, birthYear). In the above code, we pass three parameters to instantiate a Person "Amanda". Val personTwo = Person ( "Alex", 1980, true, true ) Val personOne = Person ( "Amanda", 1945, true )Įxecuting first initializer block for Alex.Įxecuting second initializer block for Alex.Ĭannot confirm if Alex is alive and married inside second initializer!Īlex is alive and married inside second constructor! It's very easy to create a custom getter for a property in Kotlin.Ĭlass Car private constructor ( val name: String, val plateNo: String ) is alive and married inside second initializer!" )Įxecuting first initializer block for Amanda.Įxecuting second initializer block for Amanda.Ĭannot confirm if Amanda is alive and married inside second initializer! Unlike value, you can't rename this special field variable. This special field variable field inside the set method is an alias for the backing field of the property-a backing field is just a field that is used by properties when you want to modify or use that field data. ![]() If empty, stop execution and throw an exception otherwise, reassign the value to a special field variable. We validated the value by checking if the value is empty. The parameter value passed to the set method represents the actual value that was assigned to the property by users-you can change the parameter name if you wish, but value is much preferred. You can see we defined our own setter method set(value) for the title right below the property definition-note that you can't modify this set() method signature because this is what the compiler expects as a custom property setter function. Throw IllegalArgumentException ( "Title must not be empty" )
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