30/09/2018, 22:55
Poll: Kiểm tra kiến thức Core Java (Garbage Collection )- 1.09
When is the Float object, created in line 3, eligible for garbage collection?
public Object m()
{
Object o = new Float(3.14F);
Object [] oa = new Object[l];
oa[0] = o; /* Line 5 */
o = null; /* Line 6 */
oa[0] = null; /* Line 7 */
return o; /* Line 8 */
}
- A. just after line 5
- B. just after line 6
- C. just after line 7
- D. just after line 8
0 voters
Answer:
Option C
[details=Explanation:]Option A is wrong. This simply copies the object reference into the array.
Option B is wrong. The reference o is set to null, but, oa[0] still maintains the reference to the Float object.
Option C is correct. The thread of execution will then not have access to the object.[/details]
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