最显著的应用当然是银行存款和取款,不要存在存取数字和实际发生不一样的情况. synchronized关键字. class BankAccount { private int balance = 100; public int getBalance() { return balance; } public void withdraw(int amount) { balance = balance - amount; } } public class RyanAndMonicaJob impleme…
Transactions are CoreAnimation's mechanism for batching multiple layer- tree operations into atomic updates to the render tree. Every modification to the layer tree requires a transaction to be part of. A CATransaction is always created every time yo…
