Alternative multithreaded producer and consumer model

Title: Now two threads, you can operate the same variable, implement a thread on the variable plus 1, a thread on the variable minus 1, the realization of alternating, to 10 rounds, the variable initial value is zero.

Import Java.util.concurrent.locks.condition;import Java.util.concurrent.locks.lock;import    Java.util.concurrent.locks.reentrantlock;class sharedata {private int number = 0;    Lock lock = new Reentrantlock ();    Condition Condition = Lock.newcondition ();        public void increment () throws Exception {Lock.lock ();            try {while (number! = 0) {condition.await ();//this.wait ();            } ++number;            System.out.println (Thread.CurrentThread (). GetName () + "\ T" + number);        Condition.signalall ();//this.notifyall ();        } catch (Exception e) {e.printstacktrace ();        } finally {Lock.unlock ();        }} public void Decrement () throws Exception {Lock.lock ();            try {while (number = = 0) {condition.await ();//this.wait ();            }--number;            System.out.println (Thread.CurrentThread (). GetName () + "\ T" + number); ConditIon.signalall ();//this.notifyall ();        } catch (Exception e) {e.printstacktrace ();        } finally {Lock.unlock (); }}//======== This is the most primitive notation used synchronized========/*public synchronized void increment () throws Exception{while (number!). = 0) {this.wait ();} ++number; System.out.println (Thread.CurrentThread (). GetName () + "\ T" +number); This.notifyall ();} Public synchronized void Decrement () throws exception{while (number = = 0) {this.wait ();} --number; System.out.println (Thread.CurrentThread (). GetName () + "\ T" +number); This.notifyall ();} */}/** * Title: Now two threads, you can manipulate the same variable, implement a thread to the variable plus 1, a thread to the variable minus 1, * realize alternating, to 10 rounds, the variable initial value is zero. * * @author admin * Create four thread operations resources (cohesion, low coupling) */public class ThreadDemo2 {public static void main (string[] args) {fi        nal sharedata sd = new Sharedata ();  New Thread (New Runnable () {@Override public void run () {for (int i = 1; I <= 10;     i++) {try {thread.sleep (200);                   Sd.increment ();                    } catch (Exception e) {e.printstacktrace ();        }}}, "AA"). Start ();  New Thread (New Runnable () {@Override public void run () {for (int i = 1; I <= 10;                        i++) {try {thread.sleep (300);                    Sd.decrement ();                    } catch (Exception e) {e.printstacktrace ();        }}}, "BB"). Start ();  New Thread (New Runnable () {@Override public void run () {for (int i = 1; I <= 10;                        i++) {try {Thread.Sleep (400);                    Sd.increment ();                    } catch (Exception e) {e.printstacktrace (); }}}, "CC"). Start ();  New Thread (New Runnable () {@Override public void run () {for (int i = 1; I <= 10;                        i++) {try {thread.sleep (500);                    Sd.decrement ();                    } catch (Exception e) {e.printstacktrace ();    }}}, "DD"). Start (); }}

In this need to pay attention to a problem in the method of the shared object to replace if to while, solve the problem of false wake.

Alternative multithreaded producer and consumer model