Java thread Problems

The code below is not too long. First, let's take a look at it and check whether there are any questions, and then run it.

 

Public class Test {
Public synchronized void t (){
New Thread (new Fuzhu (). start ();
}
Public static void main (String [] args ){
New Test (). t ();
}
}

Class Fuzhu implements Runnable {
Public void run (){
Try {
This. wait (1000 );
} Catch (Exception e ){
E. printStackTrace ();
}
}
}

After running the program, can someone explain Why java. lang. IllegalMonitorStateException: current thread not owner is returned.

Author "wpskl"