多執行緒按順序列印

**於leetcode1114

我們提供了乙個類：

public class foo

public void second()

public void third()

}三個不同的執行緒將會共用乙個 foo 例項。

請設計修改程式，以確保 second() 方法在 first() 方法之後被執行，third() 方法在 second() 方法之後被執行。

//第一種方法用reentrantlock

class
foopublic
void
first
(runnable printfirst)
throws interruptedexception 
}// printfirst.run() outputs "first". do not change or remove this line.
printfirst.
run();
flag =2;
reentrantlock.
unlock()
;}public
void
second
(runnable printsecond)
throws interruptedexception 
}// printsecond.run() outputs "second". do not change or remove this line.
printsecond.
run();
flag =3;
reentrantlock.
unlock()
;}public
void
third
(runnable printthird)
throws interruptedexception 
}// printthird.run() outputs "third". do not change or remove this line.
printthird.
run();
reentrantlock.
unlock()
;}}

//既然都volatile的flag了，直接下面這麼寫

class
foopublic
void
first
(runnable printfirst)
throws interruptedexception 
// printfirst.run() outputs "first". do not change or remove this line.
printfirst.
run();
flag =2;
}public
void
second
(runnable printsecond)
throws interruptedexception 
// printsecond.run() outputs "second". do not change or remove this line.
printsecond.
run();
flag =3;
}public
void
third
(runnable printthird)
throws interruptedexception 
// printthird.run() outputs "third". do not change or remove this line.
printthird.
run();
}}

//wait-notify

class
foopublic
void
first
(runnable printfirst)
throws interruptedexception 
// printfirst.run() outputs "first". do not change or remove this line.
printfirst.
run();
flag =2;
object.
notifyall()
;}}public
void
second
(runnable printsecond)
throws interruptedexception 
// printsecond.run() outputs "second". do not change or remove this line.
printsecond.
run();
flag =3;
object.
notifyall()
;}}public
void
third
(runnable printthird)
throws interruptedexception 
// printthird.run() outputs "third". do not change or remove this line.
printthird.
run();
object.
notifyall()
;}}}

//訊號量

class
foopublic
void
first
(runnable printfirst)
throws interruptedexception 
public
void
second
(runnable printsecond)
throws interruptedexception 
public
void
third
(runnable printthird)
throws interruptedexception 
}

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