/**
* Main method of the example
* @param args
*/
public static void main(String[] args) {
// Creates a new account ...
Account account=new Account();
// an initialize its balance to 1000
account.setBalance(1000);
// Creates a new Company and a Thread to run its task
Company company=new Company(account);
Thread companyThread=new Thread(company);
// Creates a new Bank and a Thread to run its task
Bank bank=new Bank(account);
Thread bankThread=new Thread(bank);
// Prints the initial balance
System.out.printf("Account : Initial Balance: %f\n",account.getBalance());
// Starts the Threads
companyThread.start();
bankThread.start();
try {
// Wait for the finalization of the Threads
companyThread.join();
bankThread.join();
// Print the final balance
System.out.printf("Account : Final Balance: %f\n",account.getBalance());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
结果,相同时间内，存与取执行后应该是相等的。如果我们在方法中不去使用synchronized关键字，那么得出的结果就不对了。
Account : Initial Balance: 1000.000000
Account : Final Balance: 1000.000000