线程同步的经典例子
银行存钱与取钱的例子能够很好的说明线程同步的概念
一：首先定义帐号类，其中有一个余额的字段：
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public class BankAccount {private int balance;public BankAccount( int balance) {this.balance = balance;}public int getBalance() {return balance;}/** * 存款 */public synchronized void deposit(int amount) {balance += amount;}/** * 取款 */public synchronized void withdraw(int amount) {balance -= amount;}}??