Java What is the line number in the code listing when the object x becomes available for

问题描述:

Java What is the line number in the code listing when the object x becomes available for
What is the line number in the code listing when
the object x becomes available for destruction?
A.7
B.19
C.10
*D.15

没有code,怎么知道哪一行,把code贴出来