單項(xiàng)選擇題

class Super {
public int getLenght() { return 4; }
}
public class Sub extends Super {
public long getLenght() { return 5; }
public static void main(String[] args) {
Super sooper = new Super();
Sub sub = new Sub();
System.out.println(
sooper.getLenght() + “,” + sub.getLenght() );
}
}
What is the output?（）

A. Just after line 13.
B. Just after line 14.
C. Just after line 15.
D. Just after line 16 （that is， as the method returns）.

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多項(xiàng)選擇題

Which three statements are true？（）

A. The default constructor initializes method variables.
B. The default constructor has the same access as its class.
C. The default constructor invoked the no-arg constructor of the superclass.
D. If a class lacks a no-arg constructor， the compiler always creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.

多項(xiàng)選擇題

1. class TestA {
2. TestB b；
3. TestA（） {
4. b = new TestB（this）；
5. }
6. }
7. class TestB {
8. TestA a；
9. TestB（TestA a） {
10. this.a = a；
11. }
12. }
13. class TestAll {
14. public static void main （String args[]） {
15. new TestAll（）.makeThings（）；
16. // ...code continues on
17. }
18. void makeThings（） {
19. TestA test = new TestA（）；
20. }
21. }
Which two statements are true after line 15， before main completes？（）

A. Line 15 causes a stack overflow.
B. An exception is thrown at runtime.
C. The object referenced by a is eligible for garbage collection.
D. The object referenced by b is eligible for garbage collection.
E. The object referenced by a is not eligible for garbage collection.
F. The object referenced by b is not eligible for garbage collection.

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Which three statements are true？（）

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