JAVA supports multiple threads of execution which appear to execute simultaneously WITHIN your program. Depending on your program's processing, there may be times when you must guarantee that two or more threads cannot access method at the same time. To control the number of threads that can access a method at any one time, you USE the synchronized keyword. When the Java compiler encounters the synchronized keyword, the compiler will include special code that locks the method as one thread starts executing the method's instruction and later unlocks the method as the thread exits. Normally, programs synchronize methods that access shared data. The FOLLOWING statement illustrates the use of the synchronized keyword:

synchronized void refreshData( )

Java supports multiple threads of execution which appear to execute simultaneously within your program. Depending on your program's processing, there may be times when you must guarantee that two or more threads cannot access method at the same time. To control the number of threads that can access a method at any one time, you use the synchronized keyword. When the Java compiler encounters the synchronized keyword, the compiler will include special code that locks the method as one thread starts executing the method's instruction and later unlocks the method as the thread exits. Normally, programs synchronize methods that access shared data. The following statement illustrates the use of the synchronized keyword:

synchronized void refreshData( )