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分享关于Runnables实现多线程的问题
//两个储户往同一个账户存钱
public class ThreadAccount{
public static void main(String[] args) {
Customer a = new Customer(5,1000);
Thread customer1 = new Thread(a) ;
Thread customer2 = new Thread(a);
customer1.setName("储户一");
customer2.setName("储户二");
customer1.start();
customer2.start();
}
}
class Account{
private double instance;
void deposit(int time,double money ){
int i =0;
while (true) {
synchronized (this) {
if (i < time) {
instance += money;
System.out.println(Thread.currentThread().getName() + "存钱"
+ money + "\t余额：" + instance);
i++;
}
}
}
}
}
class Customer implements Runnable {
private int time;
private double money;
Account account =new Account(); 直接创建账户对象，为什么是给相同的账户存钱
//time：存款次数 money：每次存款金额
public Customer(int time, double money) {
super();
this.time = time;
this.money = money;
}
public void run() {
// TODO Auto-generated method stub
System.out.println(account);
account.deposit(time,money);
}
}
public class ThreadAccount{
public static void main(String[] args) {
Customer a = new Customer(5,1000);
Thread customer1 = new Thread(a) ;
Thread customer2 = new Thread(a);
customer1.setName("储户一");
customer2.setName("储户二");
customer1.start();
customer2.start();
}
}
class Account{
private double instance;
void deposit(int time,double money ){
int i =0;
while (true) {
synchronized (this) {
if (i < time) {
instance += money;
System.out.println(Thread.currentThread().getName() + "存钱"
+ money + "\t余额：" + instance);
i++;
}
}
}
}
}
class Customer implements Runnable {
private int time;
private double money;
Account account =new Account(); 直接创建账户对象，为什么是给相同的账户存钱
//time：存款次数 money：每次存款金额
public Customer(int time, double money) {
super();
this.time = time;
this.money = money;
}
public void run() {
// TODO Auto-generated method stub
System.out.println(account);
account.deposit(time,money);
}
}
...全文
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rickylin86 2016-07-17
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你上面的代码是是新建一个Customer对象.然后创建两个公用这个对象的线程.而对于同一个Customer对象来说Account对象只有一个.所以当然两个线程会对同一个账户进行操作了.
三棵树aa 2016-07-17
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com.hlg.Thread.Account@1cdeff
储户一存钱1000.0 余额：1000.0
储户一存钱1000.0 余额：2000.0
储户一存钱1000.0 余额：3000.0
储户一存钱1000.0 余额：4000.0
储户一存钱1000.0 余额：5000.0
com.hlg.Thread.Account@1cdeff
储户二存钱1000.0 余额：6000.0
储户二存钱1000.0 余额：7000.0
储户二存钱1000.0 余额：8000.0
储户二存钱1000.0 余额：9000.0
储户二存钱1000.0 余额：10000.0
这是执行结果
