Assume that KeyAdapter is an abstract class with several methods that can be overridden.
In java I can do:
KeyListener keyListener = new KeyAdapter() {
@Override public void keyPressed(KeyEvent keyEvent) {
// ...
}
};
How to do the same in Kotlin?
从the official Kotlin language documentation开始:
window.addMouseListener(object : MouseAdapter() {
override fun mouseClicked(e : MouseEvent) {
// ...
}
适用于你手头的问题:
val keyListener = object : KeyAdapter() {
override fun keyPressed(keyEvent : KeyEvent) {
// ...
}
正如Peter Lamberg所指出的--如果匿名类实际上是功能接口(i.e. not of an abstract class)的实现，则可以使用SAM Conversions进一步简化此语句:
val keyListener = KeyAdapter { keyEvent ->
// ...
}
还请注意this discussion关于用Java和Kotlin定义的接口的不同用法.