多項選擇題

Which two are true？（）

A. An encapsulated， public class promotes re-use.
B. Classes that share the same interface are always tightly encapsulated.
C. An encapsulated class allows subclasses to overload methods， but does NOT allow overriding methods.
D. An encapsulated class allows a programmer to change an implementation without affecting outside code.

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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（）；

單項選擇題

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.

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Which two are true？（）

你可能感興趣的試題

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（）？

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

Which two are 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？（）