Java thread methods of communication

/ ** 
* Examples of communication threads: 1-100 printing using two threads. Thread 1, Thread 2 alternately print 
* 
* relates to three methods: 
* the wait (): This method, if implemented, the current thread enters the blocked state, and releases the synchronization monitor. 
* Notify (): When you perform this method, you will wake up a thread of wait. If there are multiple threads wait, they wake up that high priority. 
* NotifyAll (): When you perform this method, you will wake up all the wait thread. 
* 
* Description: 
* 1.wait (), Notify (), notifyAll () method must be used in three blocks or synchronization code synchronization method. 
* 2.wait (), notify () , notifyAll () method is called three must be synchronized block synchronization or synchronization monitor method. 
* Otherwise, there will be IllegalMonitorStateException abnormal 
* 3.wait (), notify () , notifyAll () method is defined in three java.lang.Object class. 
* 
* Interview questions: sleep () and wait () the similarities and differences? 
* 1. same point: Once the method performed may be such that the current thread enters the blocked state. 
* 2. Different points: 1 in different positions) declared two methods: the Thread class declaration sleep (), Object class declared in the wait () 
* 2) requires a different call: SLEEP () can be called at any desired scene . wait () must be used, or a block synchronization code synchronization method
* 3) monitors whether the release synchronization: If both methods are used in the synchronization code blocks or synchronization methods, sleep () will not release the lock, wait () releases the lock. 
* 

* / 
Class the implements the Runnable {Number The 
    Private Number = int. 1; 
    Private Object obj = new new Object (); 
    @Override 
    public void RUN () { 

        the while (to true) { 

            the synchronized (obj) { 

                obj.notify (); 

                IF (Number <= 100) { 

                    the try { 
                        the Thread.sleep (10); 
                    } the catch (InterruptedException E) { 
                        e.printStackTrace (); 
                    } 

                    System.out.println (Thread.currentThread () getName () +. ":" + Number) ;
                    ++ Number; 

                    the try { 
                        // such as call wait () method of the thread enters the blocked state 
                        obj.wait (); 
                    } the catch (InterruptedException E) { 
                        e.printStackTrace (); 
                    } 

                } the else { 
                    BREAK; 
                } 
            } 

        } 

    } 
} 


public class {CommunicationTest 
    public static void main (String [] args) { 
        Number The Number Number The new new = (); 
        the thread new new the thread T1 = (Number); 
        the thread new new the thread T2 = (Number); 

        t1.setName ( "thread 1");
        t2.setName("线程2");

        t1.start();
        t2.start();
    }
}