优化代码运用线程知识package D18; public class D18_1 { public static void main(String[] args) { // TODO Auto-generated method stub } } class Account implements Runnable{ private int money; //修改方法 //存钱 public void deposit(int amount) { money +=amount; System.out.println("存钱成功，现有"+money); } @Override public void run() { // TODO Auto-generated method stub deposit(100); } public int getMoney() { return money; } public void setMoney(int money) { this.money = money; } }

以下是对代码的优化，使用线程来实现存钱和查询余额的功能：

public class D18_1 {
    public static void main(String[] args) throws InterruptedException {
        Account account = new Account();
        Thread depositThread = new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                account.deposit(100);
            }
        });
        Thread checkThread = new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                System.out.println("当前余额为：" + account.getMoney());
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        depositThread.start();
        checkThread.start();
        depositThread.join();
        checkThread.join();
    }
}

class Account {
    private int money;

    public synchronized void deposit(int amount) {
        money += amount;
        System.out.println("存钱成功，现有" + money);
    }

    public synchronized int getMoney() {
        return money;
    }
}

这里使用了 synchronized 关键字来保证线程安全，同时使用了 join() 方法来保证查询余额的线程在存钱线程执行完毕后才开始运行，避免了查询余额时余额数值不正确的问题。