Multithreading producer-consumer model

Package Comknvkutil;

class the Message {
     Private String title;                             // header stored information 
    Private String Content;
     Private Boolean = In Flag to true ; // save the information on the content 
    public  the synchronized   void SET (title String, String Content) {
         IF (In Flag) {
             the this .title = title;         // set title attribute 
            the try {
                Thread.sleep ( 100);                 // delay operations 
            } the catch (InterruptedException E) {
                e.printStackTrace ();
            }
            this.content=content;
            flag=false;
            notify();
        }else {
        try {
            wait();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }}
    }
    public synchronized  void get() {
        if (!flag) {
            try {
                Thread.sleep(100) ;                    // 延迟
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println(this.title + " --> " + this.content);
            flag=true;
            notify();
        }else {
        try {
            wait();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }}
    
    }
}
class Producer implements Runnable {                // 定义生产者
    private Message msg = null ;
    public Producer(Message msg) {
        this.msg = msg ;
    }
    @Override
    public  void RUN () {
         for ( int X = 0; X <20 is; X ++) {                 // production data 50 
            IF (X% 2 == 0 ) {
                msg.set ( "Li Xinghua", "Java lecturer" );
            } else {
                msg.set("mldn兴华", "www.mldnjava.cn");
                }
        }
    }
}
class Consumer  implements Runnable {                // 定义消费者
    private Message msg = null ;
    public Consumer (Message msg) {
        this.msg = msg ;
    }
    @Override
    public  void RUN () {
         for ( int X = 0; X <20 is; X ++) {                 // removed data 50 
            msg.get ();
        }
    }
}
public class Testthread {
    public static void main(String[] args) throws Exception {
        MSG Message = new new Message ();                 // defines the Message object, and retrieve data stored for 
        new new the Thread ( new new Producer (MSG)) Start ();.     // start producer thread 
        new new the Thread ( new new Consumer (MSG)). Start ();     // get consumer thread 
    }
}

Something wrong with the above code is run, could not find the cause.

Package Comknvkutil;

class the Message {
     Private String title;                             // save the title information 
    Private String Content;
     Private Boolean = Flag to true ; // save the contents of the information 
    public  the synchronized   void the SET (String title, String Content) {
         IF (! {Flag)
             the try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }}
            the this .title = title;         // set title attribute 
            the try {
                Thread.sleep ( 100);                 // delay operations 
            } the catch (InterruptedException E) {
                e.printStackTrace ();
            }
            this.content=content;
            flag=false;
            notify();
    }
    public synchronized  void get() {
        if (flag) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }}
            try {
                Thread.sleep(100) ;                    // 延迟
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println(this.title + " --> " + this.content);
            flag=true;
            notify();
    }
}
class Producer implements Runnable {                // 定义生产者
    private Message msg = null ;
    public Producer(Message msg) {
        this.msg = msg ;
    }
    @Override
    public  void RUN () {
         for ( int X = 0; X <20 is; X ++) {                 // production data 50 
            IF (X% 2 == 0 ) {
                msg.set ( "Li Xinghua", "Java lecturer" );
            } else {
                msg.set("mldn兴华", "www.mldnjava.cn");
                }
        }
    }
}
class Consumer  implements Runnable {                // 定义消费者
    private Message msg = null ;
    public Consumer (Message msg) {
        this.msg = msg ;
    }
    @Override
    public  void RUN () {
         for ( int X = 0; X <20 is; X ++) {                 // removed data 50 
            msg.get ();
        }
    }
}
public class Testthread {
    public static void main(String[] args) throws Exception {
        MSG Message = new new Message ();                 // defines the Message object, and retrieve data stored for 
        new new the Thread ( new new Producer (MSG)) Start ();.     // start producer thread 
        new new the Thread ( new new Consumer (MSG)). Start ();     // get consumer thread 
    }
}

The above code is correct production - consumption patterns.