关于java:java-lambda表达式-回调函数

java应用lambda表达式做回调函数,定义一个interface写一个办法即可（如果一个接口只有一个形象办法（包含继承的），该接口是一个函数接口，函数接口能够应用lambda表达式实现），lambda表达式函数外部能够获取内部变量，会保留堆栈信息

源码

Callback.java

public interface Callback{    void onCompletion();}

Test.java

public class Test implements Runnable {    BlockingDeque<Callback> queue = new LinkedBlockingDeque<>();    void init(){        Thread thread = new Thread(this,"Test");        thread.start();    }    void sendAsync(Callback callback){        queue.add(callback);    }    @Override    public void run() {        while (true){            try {                Thread.sleep(10);                Callback callback = queue.take();                callback.onCompletion();            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

TestObject.java

public class TestObject {    public String getVal() {        return val;    }    public void setVal(String val) {        this.val = val;    }    private String val;}

Main.java

public class Main {    public static void main(String[] args) {        Test test = new Test();        test.init();        for(int i=0;i<10;i++){            String data = "i=" + i;            TestObject obj = new TestObject();            obj.setVal(data);            System.out.println("handle before" + obj + obj.getVal());            System.out.println(Thread.currentThread().getName());            test.sendAsync(()->{                System.out.println("handle"+obj + obj.getVal());                System.out.println(Thread.currentThread().getName());            });        }    }}