Locking files

The Java™ program can lock a file to prevent other users from accessing the file while the first Java program is using the file. Lock types are as follows:

• Read/Exclusive Lock - The current Java program reads records, and no other program can access the file.
• Read/Allow shared read Lock - The current Java program reads records, and other programs can read records from the file.
• Read/Allow shared write Lock - The current Java program reads records, and other programs can change the file.
• Write/Exclusive Lock - The current Java program changes the file, and no other program can access the file.
• Write/Allow shared read Lock - The current Java program changes the file, and other programs can read records from the file.
• Write/Allow shared write Lock - The current Java program changes the file, and other programs can change the file.

To give up the locks obtained through the lock() method, the Java program starts the releaseExplicitLocks() method.