30/09/2018, 22:55
Poll: Kiểm tra kiến thức Core Java (Garbage Collection )- 1.07
When is the Demo object eligible for garbage collection?
class Test
{
private Demo d;
void start()
{
d = new Demo();
this.takeDemo(d); /* Line 7 */
} /* Line 8 */
void takeDemo(Demo demo)
{
demo = null;
demo = new Demo();
}
}
- A After line 7
- B After line 8
- C After the start() method completes
- D When the instance running this code is made eligible for garbage collection.
0 voters
Answer:
Option D
[details=Explanation:]Option D is correct. By a process of elimination.
Option A is wrong. The variable d is a member of the Test class and is never directly set to null.
Option B is wrong. A copy of the variable d is set to null and not the actual variable d.
Option C is wrong. The variable d exists outside the start() method (it is a class member). So, when the start() method finishes the variable d still holds a reference.[/details]
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