單項選擇題

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.

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單項選擇題

Which statement about static inner classes is true？（）

A. An anonymous class can be declared as static.
B. A static inner class cannot be a static member of the outer class.
C. A static inner class does not require an instance of the enclosing class.
D. Instance members of a static inner class can be referenced using the class name of the static inner class.

多項選擇題

class BaseClass{
private float x= 1.0f；
protected void setVar （float f） {x = f；}
}
class SubClass extends BaseClass {
private float x = 2.0f；
//insert code here 16. }
Which two are valid examples of method overriding？（）

A. Void setVar（float f） {x = f；}
B. Public void setVar（int f） {x = f；}
C. Public void setVar（float f） {x = f；}
D. Public double setVar（float f） {x = f；}
E. Public final void setVar（float f） {x = f；}
F. Protected float setVar（） {x=3.0f； return 3.0f； }

你可能感興趣的試題

Which statement about static inner classes is true？ （）

class BaseClass{ private float x= 1.0f； protected void setVar （float f） {x = f；} } class SubClass extends BaseClass { private float x = 2.0f； //insert code here 16. } Which two are valid examples of method overriding？（）

Which statement about static inner classes is true？（）

class BaseClass{
private float x= 1.0f；
protected void setVar （float f） {x = f；}
}
class SubClass extends BaseClass {
private float x = 2.0f；
//insert code here 16. }
Which two are valid examples of method overriding？（）