單項選擇題

foo and bar are public references available to many other threads. foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， which statement is the most reliable way to ensue that foo will stop executing wait（）？

A. foo.notify（）；
B. bar.notify（）；
C. foo.notifyAll（）；
D. Thread.notify（）；
E. bar.notiFYAll（）；
F. Object.notify（）；

你可能感興趣的試題

void waitForSignal（） {
Object obj = new Object（）；
synchronized （Thread.currentThread（）） {
obj.wait（）；
obj.notify（）；
}
}
Which is true？（）

A. This code may throw an InterruptedException.
B. This code may throw an IllegalStateException.
C. This code may throw a TimeoutException after ten minutes.
D. This code will not compile unless “obj.wait（）” is replaced with “（（Thread） obj）.wait（）”.
E. Reversing the order of obj.wait（） and obj.notify（） may cause this method to complete normally.
F. A call to notify（） or notifyAll（） from another thread may cause this method to complete normally.

單項選擇題

class Computation extends Thread {
private int num；
private boolean isComplete；
private int result；
public Computation（int num） { this.num = num； }
public synchronized void run（） {
result = num * 2；
isComplete = true；
notify（）；
}
public synchronized int getResult（） {
while （!isComplete） {
try {
wait（）；
} catch （InterruptedException e） { }
}
return result；
}
public static void main（String[] args） {
Computation[] computations = new Computation [4]；
for （int i = 0； i < computations.length； i++） {
computations[i] = new Computation（i）；
computations[i] .start（）；
}
for （Computation c ： computations）
System.out.print（c.getResult（） +“ “）；
}
}
What is the result？（）

A. The code will deadlock.
B. The code may run with no output.
C. An exception is thrown at runtime.
D. The code may run with output “0 6”.
E. The code may run with output “2 0 6 4‟.
F. The code may ruin with output “0 2 4 6”.

foo and bar are public references available to many other threads. foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， which statement is the most reliable way to ensue that foo will stop executing wait（）？

你可能感興趣的試題

void waitForSignal（） { Object obj = new Object（）； synchronized （Thread.currentThread（）） { obj.wait（）； obj.notify（）； } } Which is true？（）

foo and bar are public references available to many other threads. foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， which statement is the most reliable way to ensue that foo will stop executing wait（）？

void waitForSignal（） {
Object obj = new Object（）；
synchronized （Thread.currentThread（）） {
obj.wait（）；
obj.notify（）；
}
}
Which is true？（）