单项选择题
1.public class Test {
2.public static void main （String args[]） {
3.class Foo {
4.public int i = 3；
5.}
6.Object o = （Object） new Foo（）；
7.Foo foo = （Foo）o；
8.System.out.printIn（foo. i）；
9. }
10.}
What is the result？（）
A. Compilation will fail.
B. Compilation will succeed and the program will print “3”
C. Compilation will succeed but the program will throw a ClassCastException at line 6.
D. Compilation will succeed but the program will throw a ClassCastException at line 7.
相关考题
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多项选择题
Whichtwodeclarationspreventtheoverridingofamethod？（）
A. Final void methoda（） {}
B. Void final methoda（） {}
C. Static void methoda（） {}
D. Static final void methoda（） {}
E. Final abstract void methoda（） {} -
多项选择题
public class OuterClass { private double d1 1.0； //insert code here } You need to insert an inner class declaration at line2. Which two inner class declarations are valid？（）
A. static class InnerOne { public double methoda（） {return d1；} }
B. static class InnerOne { static double methoda（） {return d1；} }
C. private class InnerOne { public double methoda（） {return d1；} }
D. protected class InnerOne { static double methoda（） {return d1；} }
E. public abstract class InnerOne { public abstract double methoda（）； } -
多项选择题
Whichtwostatementsaretrueregardingthecreationofadefaultconstructor？（）
A. The default constructor initializes method variables.
B. The default constructor invokes the no-parameter constructor of the superclass.
C. The default constructor initializes the instance variables declared in the class.
D. If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.
