P440 同步机制的课后练习

AccountTest类

class Account{
    private double balance;

    public Account(double balance) {
        this.balance = balance;
    }
    //存钱
    public synchronized void deposit(double amt){//利用synchronized解决线程安全问题
        if(amt>0){
            balance+=amt;
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+":存钱成功，余额为："+balance);
        }
    }
}
class Customer extends Thread{
    private Account acct;
    public Customer(Account acct){//利用构造器，使两个客户共用一个账户
        this.acct=acct;
    }

    @Override
    public void run() {
        for(int i=0;i<3;i++){
            acct.deposit(1000);
        }
    }
}
public class AccountTest {
    public static void main(String[] args) {
        Account acct=new Account(0);
        Customer c1 = new Customer(acct);
        Customer c2 = new Customer(acct);

        c1.setName("甲");
        c2.setName("乙");

        c1.start();
        c2.start();
    }
}