public class Transaction extends Thread {

private final String id;

private final Account from;

private final Account to;

private final double amount;

public Transaction(String id, Account from, Account to, double amount) {

this.id = id;

this.from = from;

this.to = to;

this.amount = amount;

}

@Override

public void run() {

// Acquire the lock of Account 'from'

synchronized (from) {

from.withdraw(amount);

try {

Thread.sleep(500);

} catch (InterruptedException e) { }

// Acquire the lock of Account 'to'

synchronized (to) {

to.deposit(amount);

}

// Release the lock of Account 'to'

}

// Release the lock of Account 'from'

System.out.println(amount + "is transfered from " + from + " to " + to);

}

}