Kotlin与java8的SAM转换对比(进阶)

ExecutorService executorService= Executors.newScheduledThreadPool(3);

  executorService.execute(new Runnable() {
   @Override
   public void run() {
    System.out.println("hello world");
   }
  });

xecutorService.execute(()->System.out.println("hello world"));

 val executorService: ExecutorService = Executors.newScheduledThreadPool(3)
 //kotlin中的 匿名内部类的标准写法
 executorService.submit(object :Runnable{
  override fun run() {
   System.out.println("hello world")
  }
 })

executorService.submit { System.out.println("hello world") }

//kotlin中 匿名内部类 还可以这么写
 executorService.submit(Runnable { println("hello world") })

interface Invokable{
 fun invoke()
}


fun submit(invokable: Invokable){
 invokable.invoke()
}

fun submit2(block:()->Unit){
 block.invoke()
}

typealias Funtionx = () -> Unit

fun submit2(block: Funtionx) {
 block.invoke()
}

public class EventManager {
 interface OnEventListener {
  void onEvent(int event);
 }

 private List<OnEventListener> onEventListeners=new ArrayList<OnEventListener>();

 public void addOnEventListener(OnEventListener listener){
  onEventListeners.add(listener);
 }

 public void removeEventListener(OnEventListener listener){
  onEventListeners.remove(listener);
 }
}

 val eventManager = EventManager()
 eventManager.addOnEventListener {
  println("onEvent$it")
 }

 eventManager.addOnEventListener(object : EventManager.OnEventListener {
  override fun onEvent(event: Int) {
   {
    println("onEvent$event")
   }()
  }
 })

 eventManager.addOnEventListener(object : EventManager.OnEventListener {
  override fun onEvent(event: Int) {
   println("onEvent$event")
  }
 })

 val onEvent = EventManager.OnEventListener {
  println("onEvent$it")

 }

 eventManager.addOnEventListener(onEvent)
 eventManager.removeEventListener(onEvent)

val onEvent2 = object : EventManager.OnEventListener {
  override fun onEvent(event: Int) {
   println("onEvent$event")
  }
 }