Kotlin Essentials by Marcin Moskała

Author:Marcin Moskała [Marcin Moskała]
Language: eng
Format: epub, pdf
Publisher: leanpub.com
Published: 2022-08-30T00:00:00+00:00

In practice, object expressions are used as an alternative to Java anonymous classes, i.e., when we need to create a watcher or a listener with multiple handler methods.

taskNameView.addTextChangedListener(object : TextWatcher { override fun afterTextChanged( editable: Editable? ) { //... } override fun beforeTextChanged( text: CharSequence?, start: Int, count: Int, after: Int ) { //... } override fun onTextChanged( text: CharSequence?, start: Int, before: Int, count: Int ) { //... } })

Note that “object expression” is a better name than “anonymous class” since this is an expression that produces an object.

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