Java? ??? ?? ???? ? ?? ??? ??? ????. 1. newCachedThreadPool? ?? ??? ??? ?? ?????. 2. newFixedThreadPool? ?? ?? ??? ?? ?????. 3. newScheduledThreadPool? ?? ?? ??? ?? ?????.

Java? Executor? ?? ??? ?? 4?? ??? ?? ?????.
newCachedThreadPool? ??? ?? ??? ?? ?? ??? ???? ?? ???? ?? ?? ?? ???? ???? ???? ? ????. ??? ???? ?????.

newFixedThreadPool? ?? ?? ??? ?? ??? ? ?? ?? ?? ??? ?? ?????. ?? ???? ????? ?????.

newScheduledThreadPool? ???? ???? ?? ??? ???? ?? ?? ?? ??? ?? ?????.

newSingleThreadExecutor? ??? ???? ?? ??? ??? ???? ???? ?? ??? ??? ?? ???? ?? ??? ??? ??(FIFO, LIFO, ?? ??)? ????? ?????.

??? ??? ??? ???? ?????. Java ?? ?????: ??? ? ??

1.newCachedThreadPool ?? ??? ?? ???? ??? ???? ?? ??? ??? ??? ? ????. ??? ???? ???? ????.

public static void main(String[] args) {  
        ExecutorService cachedThreadPool = Executors.newCachedThreadPool();  
        for (int i = 0; i < 10; i++) {  
            final int index = i;  
            try {  
                Thread.sleep(10);  
            } catch (InterruptedException e) {  
                e.printStackTrace();  
            }  
            cachedThreadPool.execute(new Runnable() {  
                public void run() {  
                    System.out.println(index);  
                }  
            });  
        }  
    }

2.newFixedThreadPool

public static void main(String[] args) {  
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(3);  
        for (int i = 0; i < 10; i++) {  
            final int index = i;  
            fixedThreadPool.execute(new Runnable() {  
                public void run() {  
                    try {  
                        System.out.println(index);  
                        Thread.sleep(10);  
                    } catch (InterruptedException e) {  
                        e.printStackTrace();  
                    }  
                }  
            });  
        }  
    }

3.newScheduledThreadPoo

public static void main(String[] args) {  
        ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5);  
        for (int i = 0; i < 10; i++) {  
            scheduledThreadPool.schedule(new Runnable() {  
                public void run() {  
                    System.out.println("delay 3 seconds");  
                }  
            }, 3, TimeUnit.SECONDS);  
        }  
  
    }

4.newSingleThreadExecutor? ??? ??? ????? ?????. ??? ?? ???? ?? ? ??? ?? ???? ??? ??? ??? ???? ?? ? ????.

public static void main(String[] args) {  
        ExecutorService singleThreadExecutor = Executors.newSingleThreadExecutor();  
        for (int i = 0; i < 10; i++) {  
            final int index = i;  
            singleThreadExecutor.execute(new Runnable() {  
                public void run() {  
/*                  System.out.println(index);*/  
                    try {  
                        System.out.println(index);  
                        Thread.sleep(2000);  
                    } catch (InterruptedException e) {  
                        e.printStackTrace();  
                    }  
                }  
            });  
        }  
    }

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