SE_Kỳ 2_PRO192

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Terms in this set (218)

7. Consider the following application:
1. class Q7 {
2. public static void main(String args[]) {
3. double d = 12.3;
4. Decrementer dec = new Decrementer();
5. dec.decrement(d);
6. System.out.println(d);
7. }
8. } 9.
10. class Decrementer {
11. public void decrement(double decMe) {
12. decMe = decMe - 1.0;
13. }
14. }

What value is printed out at line 6?

A. 0.0
B. 1.0
C. 12.3
D. 11.3

char c = '\u1234';

18. Which of the following are legal?
A. char c = 0x1234;
B. char c = \u1234;
C. char c = '\u1234';

After line 2 executes, the StringBuffer object is eligible for garbage collection.

19. Consider the following code:
1. StringBuffer sbuf = new StringBuffer();
2. sbuf = null;
3. System.gc();

Choose all true statements:
A. After line 2 executes, the StringBuffer object is garbage collected.
B. After line 3 executes, the StringBuffer object is garbage collected.
C. After line 2 executes, the StringBuffer object is eligible for garbage collection.
D. After line 3 executes, the StringBuffer object is eligible for garbage collection.

int x = -1; x = x >>> 5;

3. Which of the following expressions results in a positive value in x?
A. int x = -1; x = x >>> 5;
B. int x = -1; x = x >>> 32;
C. byte x = -1; x = x >>> 5;
D. int x = -1; x = x >> 5;

11. Suppose ob1 and ob2 are references to instances of java.lang.Object. If (ob1 == ob2) is
false, can ob1.equals(ob2) ever be true?
A. Yes
B. No