Basic HTML version of Foils prepared Sept 21 1998

Foil 14 Threads and Synchronization - Example

From Java Tutorial 98- 4: Multi-Treading, Useful Java Classes, I/O and Networking NAVO Tutorial -- Sept 23 1998. by Geoffrey C. Fox, Nancy McCracken
Thread Synchronization Examples for Foil 14
Suppose that several threads are updating a bank balance (i.e., several threads can access one instance of class Account below). Then a thread that finds insufficient funds to debit an account can wait until another thread adds to the account:
  • public class Account
  • { int bankBalance; ...
  • public synchronized void DebitAcct (int amt)
  • { while ((bankBalance - amt) < 0) wait();
  • bankBalance -= amt; ... }
  • public synchronized void CreditAcct (int amt)
  • { bankBalance += amt;
  • notify(); ... } }

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