Java?? ???? ???? ? ?? ??? ??? ????. 1. Thread ???? ???? ???? ?????. 2. Runnable ?????? ???? ???? ?????. 3. Callable ? Future? ???? ???? ?????.

Java? Thread ???? ???? ???? ???? ?? ??? ??? Thread ??? ?? ?? ?? ???? ?????? ???. Java? ??? ?? ? ?? ???? ???? ??? ? ????.

1) Thread ???? ???? ???? ?????.

2) Runnable ?????? ???? ???? ?????.

3) Callable ? Future? ???? ??? ??

???? ???? ? ?? ??? ?? ???????.

------------??? ??? ?? Thread ??? ??------------ --- -----

Thread ???? ???? ?? ???? ???? ???? ???? ??? ??? ????

1】D Thread ???? ?? ???? ???? run? ??????. () ???? ??? ? ? ???? ??? ??? ???? ???? ?? ???? run() ???? ??? ?? ?????? ???.

2】Thread ?? ???? ???? ??, ? ??? ?? ??

3】??? ??, ? ???? start() ??? ??

?? ??

public class MyThread extends Thread{//繼承Thread類
　　public void run(){
　　//重寫run方法
　　}
}
public class Main {
　　public static void main(String[] args){
　　　　new MyThread().start();//創(chuàng)建并啟動線程
　　}
}

-- --------??? ??? ?? Runnable ????? ??---------------- -----

Runnable ?????? ???? ???? ???? ???? ???? ??? ??? ????.

1] Runnable ?????? ?? ???? ???? run()? ?? ?????. ? run() ???? Thread? run() ???? ?????. ???? ?? ??? ?????

2] Runnable ?? ???? ????? ???? ? ????? ???? ?????. ? Thread ??? ?? ??? ?????

3] ? ?? ??? ??? ????? ??? start() ???? ???? ?????.

?? ?:

public class MyThread2 implements Runnable {//實現(xiàn)Runnable接口
　　public void run(){
　　//重寫run方法
　　}
}
public class Main {
　　public static void main(String[] args){
　　　　//創(chuàng)建并啟動線程
　　　　MyThread2 myThread=new MyThread2();
　　　　Thread thread=new Thread(myThread);
　　　　thread().start();
　　　　//或者    new Thread(new MyThread2()).start();
　　}
}

-------------------------Callable? ???? Future? ??? ??? ----------------- ---------

Runnable ?????? ?? Callable ?????? ??? ?? ???? call() ???? ????, call() ???? run() ????? ? ????? .

》call() ???? ?? ?? ?? ? ????

》call() ???? ??? ?????? ??? ? ????.

Java5? ??? ?? ?? ???? Future ?????? ?????( ) ???? ??? Future ??????? FutureTask ?? ???? ?????. ? ?? ???? Future ?????? Runnable ?????? ?? ????? Thread ???? ???? ??? ? ????. ??? ?? ?? ???? ???? ?? Future ?????? ?? ?? ???? ???? ????.

>boolean cancel(boolean mayInterruptIfRunning): View? Future

>V get(): Callable?? call() ???? ?? ?? ?????. ? ???? ???? ????? ??? ?????. ?? ???? ??? ? ?? ?? ?? ??? ???? ???.

> V get(long timeout, TimeUnit ??): Callable?? call() ???? ?? ?? ?????. ?? ?? ?? ?? ?????. ??? ?? ??? ??? ???? ??? TimeoutException? ?????

> ;boolean isDone(): Callable ??? ???? True? ?????

>boolean isCancelled(): Callable ??? ??? ??? ?? Callable ??? ????? ???? True? ?????

?? ??? ??? ? ?? ?? ???? ?????. ???? ??? ??? ????.

1] Callable ?????? ?? ???? ???? ??? ?????( ) ???? ??? ?? ?? ???? ????? ?????(java8?? ???? Lambda ???? ???? Callable ??? ?? ??? ? ????).

2] FutureTask ???? ???? Callable ??? call() ???? ?? ?? ????? Callable ??? ?????.

3] FutureTask ??? Thread ??? ???? ???? ?????. ??? ???? ?????(FutureTask? Runnable ?????? ???? ???)

4] ?? ??? ??? ?? ? ?? ?? ???? FutureTask ??? get() ???? ?????

?? ?:

public class Main {
　　public static void main(String[] args){
　　　MyThread3 th=new MyThread3();
　　　//使用Lambda表達式創(chuàng)建Callable對象
　　   //使用FutureTask類來包裝Callable對象
　　　FutureTask<Integer> future=new FutureTask<Integer>(
　　　　(Callable<Integer>)()->{
　　　　　　return 5;
　　　　}
　　  );
　　　new Thread(task,"有返回值的線程").start();//實質(zhì)上還是以Callable對象來創(chuàng)建并啟動線程
　　  try{
　　　　System.out.println("子線程的返回值："+future.get());//get()方法會阻塞，直到子線程執(zhí)行結(jié)束才返回
 　　 }catch(Exception e){
　　　　ex.printStackTrace();
　　　}
　　}
}

---------- ----------------3?? ??? ?? ?? ??---- ------------- --------

Runnable ?????? Callable ?????? ???? ??? ????? ?????. ?? ??? call() ??? ?? ? ?? ?? ??, ??? ??? ?? ??? run() ????? ?? ?? ???? ? ? ???? ???? ??? ??? ? ????. Thread ???? ???? ???? ??? ????.

1. ???? Runnable ?? Callable ?????? ???? ?? ???? ??? ? ????.

2. ?? ???? ?? ???? ?? ??? ??? ? ???, ?? ?? ???? ??? ???? ???? ??? ?? ?????.

3. ??? ?????? ?? ?????. ?? ???? ????? ?? ?? Thread.currentThread() ???? ???? ???.

4. Thread ???? ???? ??? ???? ?? ?? ???? ??? ? ????(Java ?? ?? ??).

??: ????? ?? ???? ???? ?? ?????? ???? ?? ????

? ?? ????? ?? ??? ??? ????? ??? ??? ?????! !

? ??? Java?? ???? ???? ? ?? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!