单项选择题

public class Test { 
public static void main(String[] args) { 
int x = 0; 
assert (x > 0) ? “assertion failed” : “assertion passed”; 
System.out.println(“Finished”); 
} 
} 
What is the result?()  

A. finished
B. Compilation fails.
C. An AssertionError is thrown and finished is output.
D. An AssertionError is thrown with the message “assertion failed”.
E. An AssertionError is thrown with the message “assertion passed”.


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6.单项选择题

public void test(int x) { 
int odd = x%2; 
if (odd) { 
 System.out.println(“odd); 
} else { 
System.out.println(“even”); 
} 
} 
Which statement is true?() 

A.Compilation fails.
B. “odd” will always be output.
C. “even” will always be output.
D. “odd” will be output for odd values of x, and “even” for even values.
E. “even” will be output for add values of x, and “odd” for even values.

8.多项选择题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.

9.多项选择题

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.