單項(xiàng)選擇題

ClassOne.java
1. package com.abc.pkg1；
2. public class ClassOne {
3. private char var = ‘a’；
4. char getVar（） {return var；}
5. }
ClassTest.java
1. package com.abc.pkg2；
2. import com.abc.pkg1.ClassOne；
3. public class ClassTest extends ClassOne {
4. public static void main（String[]args） {
5. char a = new ClassOne（）.getVar（）；
6. char b = new ClassTest（）.getVar（）；
7. }
8. }
What is the result？（）

A. Compilation will fail.
B. Compilation succeeds and no exceptions are thrown.
C. Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.
D. Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.

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多項(xiàng)選擇題

AnInterface is an interface.
AnAdapter0 is a non-abstract， non-final class with a zero argument constructor.
AnAdapter1 is a non-abstract， non-final class without a zero argument constructor， but with a constructor that takes one int argument.
Which two construct an anonymous inner class？（）

A.AnAdapter1 aa=new AnAdapter1（）{}
B.AnAdapter0 aa=new AnAdapter0（）{}
C.AnAdapter0 aa=new AnAdapter0（5）{}
D.AnAdapter1 aa=new AnAdapter1（5）{}
E.AnInterface a1=new AnInterface（5）{}

單項(xiàng)選擇題

1. class A {
2. public byte getNumber （） {
3. return 1；
4. }
5. }
6.
7. class B extends A {
8. public short getNumber（） {
9. return 2；
10. }
11.
12. public static void main （String args[]） {
13. B b = new B （）；
14. System.out.printIn（b.getNumber（））
15. }
16. }
What is the result？（）

A. Compilation succeeds and 1 is printed.
B. Compilation succeeds and 2 is printed.
C. An error at line 8 causes compilation to fail.
D. An error at line 14 causes compilation to fail.
E. Compilation succeeds but an exception is thrown at line 14.