A. Line 5 will not compile， because void methods cannot be overridden.
B. Line 12 will not compile， because there is no version of test（） that rakes a charargument.
C. The code will compile but will throw an exception at line 12.
D. The code will compile and produce the following output： I am an int.
E. The code will compile and produce the following output： I am a String.

A. Garbage collection cannot be forced.
B. Call System.gc（）.
C. Call System.gc（）， passing in a reference to the object to be garbage collected.
D. Call Runtime.gc（）.
E. Set all references to the object to new values（null， for example）.