
PRO192_part6
Authored by Phạm Ngân
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University
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21 questions
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2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
31. Suppose threads aThread and bThread are both accessing a shared object named sharedOb, and aThread has just executed:
sharedOb.wait();
What code can bThread execute in order to get aThread out of the waiting state, no matter what other conditions prevail?
A. aThread.notify();
B. aThread.notifyAll();
C. aThread.interrupt();
D. sharedOb.notify();
E. sharedOb.notifyAll();
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
39. What relationship does the extends keyword represent?
A. "is a"
B. "has a"
C. Polymorphism
D. Multivariance
E. Overloading
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
38. Given the following code:
1. class Xyz {
2. float f;
3. Xyz() {
4. ??? // What goes here?
5. }
6. Xyz(float f) {
7. this.f = f;
8. }
9. }
What code at line 4 results in a class that compiles?
A. super();
B. this(1.23f);
C. this(1.23f); super();
D. super(1.23f); this(1.23f);
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
37. What happens when you try to compile the following code and run the Zebra application?
class Animal { float weight; Animal(float weight) {
this.weight = weight;
}
}
class Zebra extends Animal {
public static void main(String[] args) { Animal a = new Animal(222.2f);
Zebra z = new Zebra();
}
}
A. Class Animal generates a compiler error.
B. Class Zebra generates a compiler error.
C. The code compiles without error. The application throws an exception when the Animal
constructor is called.
D. The code compiles without error. The application throws an exception when the Zebra
constructor is called.
E. The code compiles and runs without error.
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
35. Suppose classes Lemon and Grapefruit extend class Citrus. Which statements are true regard- ing the following code?
1. Grapefruit g = new Grapefruit();
2. Citrus c = (Citrus)g;
3. Lemon lem = (Lemon)c;
A. The cast in line 2 is not necessary.
B. Line 3 causes a compiler error.
C. The code compiles, and throws an exception at line 3.
D. The code compiles and runs without throwing any exceptions.
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