SCJP程序員認證考試多項選擇題每日一練(2020.06.06)

A. Class B’s constructor is public.
B. Class B’s constructor has no arguments.
C. Class B’s constructor includes a call to this（）.
D. Class B’s constructor includes a call to super（）.

A.public class MinMax<？>{
B.public class MinMax<？ extends Number>{
C.public class MinMax<N extends Object>{
D.public class MinMax<N extends Number>{
E.public class MinMax<？ extends Object>{
F.public class MinMax<N extends Integer>{

A. Line 16 is never executed.
B. An exception is thrown at runtime.
C. Line 13 creates a File object named “d”.
D. Line 14 creates a File object named “f‟.
E. Line 13 creates a directory named “d” in the file system.
F. Line 16 creates a directory named “d” and a file  “f”  within it in the file system.
G. Line 14 creates a file named "f " inside of the directory named “d” in the file system.

A. int ia = new int [15]；
B. float fa = new float [20]；
C. char ca = “Some String”；
D. Object oa = new float[20]；
E. Int ia = （4， 5， 6） （1， 2， 3）

A. Line 15 causes a stack overflow.
B. An exception is thrown at runtime.
C. The object referenced by a is eligible for garbage collection.
D. The object referenced by b is eligible for garbage collection.
E. The object referenced by a is not eligible for garbage collection.
F. The object referenced by b is not eligible for garbage collection.