1042
java線程學習4——線程同步之同步代碼塊
模擬一個場景，兩個人對同一個賬戶同時取錢
package cn.xy.Thread;
public class Account
{
/**
* 賬戶號
*/
private String accountNo;
/**
* 賬戶餘額
*/
private double balance;
public Account()
{
super();
}
public Account(String accountNo, double balance)
{
super();
this.accountNo = accountNo;
this.balance = balance;
}
@Override
public int hashCode()
{
return accountNo.hashCode();
}
@Override
public boolean equals(Object obj)
{
if (null != obj && obj.getClass() == Account.class)
{
Account target = (Account) obj;
return target.accountNo.equals(accountNo);
}
return false;
}
/***************************************************************************/
public String getAccountNo()
{
return accountNo;
}
public void setAccountNo(String accountNo)
{
this.accountNo = accountNo;
}
public double getBalance()
{
return balance;
}
public void setBalance(double balance)
{
this.balance = balance;
}
}
package cn.xy.Thread;
public class DrawThread extends Thread
{
/**
* 模擬賬戶
*/
private Account ac;
/**
* 當前取錢線程希望取得的錢數
*/
private double drawAmount;
public DrawThread(String name, Account ac, double drawAmount)
{
super(name);
this.ac = ac;
this.drawAmount = drawAmount;
}
@Override
public void run()
{
// 同時需要操作的賬戶作為同步監視器,synchronized{}中的代碼被稱為同步代碼塊
synchronized (ac)
{
if (ac.getBalance() >= drawAmount)
{
System.out.println(getName() + "取出鈔票成功" + drawAmount);
ac.setBalance(ac.getBalance() - drawAmount);
System.out.println("餘額為" + ac.getBalance());
}
else
{
System.out.println("餘額不足");
}
}
}
}
package cn.xy.Thread;
public class Test
{
public static void main(String[] args)
{
Account ac = new Account("00000001",1000);
Thread t1 = new Thread(new DrawThread("Lily", ac, 800));
Thread t2 = new Thread(new DrawThread("Tom", ac, 800));
t1.start();
t2.start();
}
}
最後更新：2017-04-03 20:19:46