线程notify（）
package student;
class teacher{
public synchronized void say(){


System.out.println("在说话");
//Thread.sleep(100000);

try {
this.wait();
} catch (InterruptedException e) {

e.printStackTrace();
}
System.out.println("我醒了@");
}

public synchronized void sayhello(){
System.out.println("我在说hello");


}
}
 class thread1 implements Runnable{
public static teacher tea=new teacher();
  public void run(){
   
   
  try {
  tea.say();
 


} catch (Exception e) {

e.printStackTrace();
}
   
  }

   
   
}
 
 public class Demo{
 
  public static void main(String[] args){
   
   
  thread1 tre=new thread1();
  new Thread(tre).start();
  try {
Thread.sleep(1222);
} catch (InterruptedException e) {

e.printStackTrace();
}
  thread1.tea.sayhello();
  thread1.tea.notify();//这里提示错误了！
   
   
  }
 
 }
 提示是：java.lang.IllegalMonitorStateException异常！、
请大虾看看！


------解决方案--------------------
同步块中才能使用wait和notify
否则就是报这个错