Specifications

Sun Services
Java™ Programming Language Module 13, slide 19 of 37
Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. Sun Services, Revision F
The Object Lock Flag
Object this
public char pop() {
synchronized (this) {
idx--;
return data[idx];
}
}
Another thread, trying to
Waiting for
lock flag missing
object lock
Code or
Behavior
Data or
State
execute synchronized(this)