Java中Synchronized的用法

/**
* 同步執行緒
*/class syncthread implements runnable 
public
void
run()  catch (interruptedexception e) }}
}public
intgetcount() 
}

syncthread syncthread =
new syncthread();
thread thread1 =
newthread(syncthread, "syncthread1");
thread thread2 =
newthread(syncthread, "syncthread2");
thread1.start();
thread2.start();

thread thread1 =
newthread(new syncthread(), "syncthread1");
thread thread2 =
newthread(new syncthread(), "syncthread2");
thread1.start();
thread2.start();

syncthread syncthread1 = new syncthread();
syncthread syncthread2 = new syncthread();
thread thread1 = new thread(syncthread1, "syncthread1");
thread thread2 = new thread(syncthread2, "syncthread2");
thread1.start();
thread2.start();

class
counter
implements
runnable
public
void countadd()  catch (interruptedexception e) }}
}//非synchronized**塊，未對count進行讀寫操作，所以可以不用synchronized
public
void printcount()  catch (interruptedexception e) }}
public
void run()  else
if (threadname.equals("b")) 
}}

counter counter =
new counter();
thread thread1 =
newthread(counter, "a");
thread thread2 =
newthread(counter, "b");
thread1.start();
thread2.start();

/**
* 銀行賬戶類
*/class account 
//存錢
public
void
deposit(float amt)  catch (interruptedexception e) 
}//取錢
public
void
withdraw(float amt)  catch (interruptedexception e) 
}public
float
getbalance() 
}/**
* 賬戶操作類
*/class accountoperator implements runnable
public
void
run() 
}}

account account = new account("zhang san", 10000.0f);
accountoperator accountoperator = new accountoperator(account);
final
int thread_num = 5;
thread threads = new thread[thread_num];
for (int i = 0; i < thread_num; i ++)

public
void
method3(someobject obj)
}

class
test
implements
runnable
}public
void run() 
}

public synchronized void
run()  catch (interruptedexception e) 
}}

public synchronized void method
()

public void method
()}

class
parent 
}class
child
extends
parent 
}

class
parent 
}class
child
extends
parent 
}

構造方法不能使用synchronized關鍵字，但可以使用synchronized**塊來進行同步。

public synchronized static void method
()

/**
* 同步執行緒
*/class syncthread implements runnable 
public
synchronized
static
void
method()  catch (interruptedexception e) }}
public
synchronized
void
run() 
}

syncthread syncthread1 =
new syncthread();
syncthread syncthread2 =
new syncthread();
thread thread1 =
newthread(syncthread1, "syncthread1");
thread thread2 =
newthread(syncthread2, "syncthread2");
thread1.start();
thread2.start();

class classname 
}}

/**
* 同步執行緒
*/class syncthread implements runnable 
public
static
void
method()  catch (interruptedexception e) }}
}public
synchronized
void
run() 
}

****************************************talk is cheap, show me the code***********************************====

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