Junior
What methods are available in data class in Kotlin?
sobes.tech AI
Answer from AI
A data class in Kotlin automatically generates the following methods:
equals(): Compares objects based on the values of properties declared in the constructor.hashCode(): Generates a hash code based on the properties declared in the constructor.toString(): Returns a string representation of the object in the format"ClassName(prop1=value1, prop2=value2)".copy(): Creates a new object by copying the properties of the original, with the possibility to modify some properties.componentN(): Generates functionscomponent1(),component2(), etc., for each property in the order they are declared, allowing destructuring declarations.
data class User(val name: String, val age: Int)
fun main() {
val user1 = User("Alice", 30)
val user2 = User("Alice", 30)
val user3 = User("Bob", 25)
// equals()
println(user1 == user2) // true
println(user1 == user3) // false
// hashCode()
println(user1.hashCode())
println(user2.hashCode())
// toString()
println(user1.toString()) // User(name=Alice, age=30)
// copy()
val user4 = user1.copy(age = 31)
println(user4) // User(name=Alice, age=31)
// componentN() and Destructuring Declaration
val (name, age) = user1
println("Name: $name, Age: $age") // Name: Alice, Age: 30
}