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In Kotlin, a data class comes with a copy()function that can be used to create a new object identical to the original object, while changing some of its properties. copy()The function returns a new object with the same properties as the original object, but some properties can be modified through parameters.
Here is an example:
data class Person(val name: String, val age: Int)
val john = Person("John", 30)
val jane = john.copy(name = "Jane")
println(john) // 输出: Person(name=John, age=30)
println(jane) // 输出: Person(name=Jane, age=30)
In the example above, we first created a Personobject john, then used copy()the function to create a new Personobject janewith namethe property set to "Jane". It can be seen that the property janeof namehas been modified, while other properties are johnthe same as .
If you want to modify all but one or more properties, you can use copy()the function's default argument:
val john = Person("John", 30)
val johnCopy = john.copy(age = 31)
println(john) // 输出: Person(name=John, age=30)
println(johnCopy) // 输出: Person(name=John, age=31)
In the above example, we use copy()the default parameters of the function, only modify agethe property, and other properties are johnthe same as .