java的同步三種方式--銀行取錢問題
阿新 • • 發佈：2018-12-31
第二種方式的例子：
class Account1 {
private double balance ;
public Account1(double balance )
{
super();
this.balance = balance ;
}
public double getBalance()
{
return balance;
}
public void setBalance(double balance)
{
this.balance = balance;
}
// 同步方法
// 取錢
/**
* 同步方法的同步監聽器物件: 若該方法是非靜態的那麼就是this
* 若方法是靜態那麼就是同步方法所在類的 Class clz = Account2.class;(一份位元組碼)
*/
public synchronized void draw(double drawMoney )
{
//能取錢的操作函式
if(balance >= drawMoney)
{
//取出多少錢
System.out.println(Thread.currentThread().getName()+
"取出多少錢"+drawMoney);
try {
Thread.sleep(1);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//設定賬戶餘額還有多少
setBalance(balance - drawMoney);
// 餘額還有多少
System.out.println(Thread.currentThread().getName()+
"賬戶的餘額是："+getBalance());
}
else{
System.out.println(Thread.currentThread().getName()+
"賬戶餘額不足，餘額為："+getBalance());
}
}
}
class ATM1 implements Runnable{
// 取得錢數
private double drawMoney;
private Account1 a;
public ATM1(double drawMoney, Account1 a)
{
this.drawMoney = drawMoney;
this.a = a;
}
public void run()
{
a.draw(drawMoney);
}
}
public class synchronizedThread {
public static void main(String [] args)
{
Account1 a = new Account1(1000);
ATM1 atm = new ATM1 (800,a);
//對於相同的賬戶，不同的人去取錢
new Thread(atm, "AA").start();
new Thread(atm, "BB").start();
new Thread(atm, "CC").start();
}
}
class Account1 {
private double balance ;
public Account1(double balance )
{
super();
this.balance = balance ;
}
public double getBalance()
{
return balance;
}
public void setBalance(double balance)
{
this.balance = balance;
}
// 同步方法
// 取錢
/**
* 同步方法的同步監聽器物件: 若該方法是非靜態的那麼就是this
* 若方法是靜態那麼就是同步方法所在類的 Class clz = Account2.class;(一份位元組碼)
*/
public synchronized void draw(double drawMoney )
{
//能取錢的操作函式
if(balance >= drawMoney)
{
//取出多少錢
System.out.println(Thread.currentThread().getName()+
"取出多少錢"+drawMoney);
try {
Thread.sleep(1);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//設定賬戶餘額還有多少
setBalance(balance - drawMoney);
// 餘額還有多少
System.out.println(Thread.currentThread().getName()+
"賬戶的餘額是："+getBalance());
}
else{
System.out.println(Thread.currentThread().getName()+
"賬戶餘額不足，餘額為："+getBalance());
}
}
}
class ATM1 implements Runnable{
// 取得錢數
private double drawMoney;
private Account1 a;
public ATM1(double drawMoney, Account1 a)
{
this.drawMoney = drawMoney;
this.a = a;
}
public void run()
{
a.draw(drawMoney);
}
}
public class synchronizedThread {
public static void main(String [] args)
{
Account1 a = new Account1(1000);
ATM1 atm = new ATM1 (800,a);
//對於相同的賬戶，不同的人去取錢
new Thread(atm, "AA").start();
new Thread(atm, "BB").start();
new Thread(atm, "CC").start();
}
}