线程同步方法二（synchronized）

package com.yli.thread.lock;

public class SynchronizedTest {

	public static final int TOTAL_AMOUNT = 100000;

	public static void main(String[] args) {
		Bank2 bank = new Bank2("yli", TOTAL_AMOUNT);
		Bank2 targetBank = new Bank2("ylz", 0);
		System.out.println(Thread.currentThread().getName() + "=========>总额="
				+ (bank.getBalance() + targetBank.getBalance()));
		for (int i = 0; i < 20000; i++) {
			TransferBank2 transfer = new TransferBank2(bank, targetBank, 5);
			Thread thread = new Thread(transfer);
			thread.setName("Transfer-" + i);
			thread.start();
		}
	}
}

class TransferBank2 implements Runnable {

	private Bank2 bank;
	private Bank2 targetBank;
	private int amount;

	public TransferBank2(Bank2 bank, Bank2 targetBank, int amount) {
		this.bank = bank;
		this.targetBank = targetBank;
		this.amount = amount;
	}

	@Override
	public void run() {
		this.bank.transferAccount(targetBank, amount);
	}

}

class Bank2 {

	private String name;
	private int balance;

	public Bank2(String name, int balance) {
		this.name = name;
		this.balance = balance;
	}

	/**
	 * synchronized提供了隐式锁机制,与ReentrantLock的lock()+unlock()作用相同
	 * wait()+notifyAll()的机制与Condition.await() + Condition.singalAll()相同
	 * @param targetBank
	 * @param amount
	 */
	public synchronized void transferAccount(Bank2 targetBank, int amount) {
		try {
			while (this.balance < amount) {
				this.wait();
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

		this.balance -= amount;
		targetBank.balance += amount;
		int total = this.getBalance() + targetBank.getBalance();
		System.out.println(Thread.currentThread().getName() + "=========>总额="
				+ total);
		if (total != SynchronizedTest.TOTAL_AMOUNT) {
			Thread.currentThread().interrupt();
			try {
				throw new InterruptedException("================>转账错误,停止运行");
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}

		this.notifyAll();

	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public synchronized int getBalance() {
		return balance;
	}

	public void setBalance(int balance) {
		this.balance = balance;
	}

}