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Topic: 内部类与外部类的问题？

1.内部类与外部类的问题？

Posted by: chenyajun5
Posted on: 2004-12-21 17:05

Given:
1. public class Outer{
2. public void someOuterMethod() {
3. // Line 3
4. }
5. public class Inner{}
6. public static void main( String[]argv ) {
7. Outer o = new Outer();
8. // Line 8
9. }
10. }
Which instantiates an instance of Inner?
A. new Inner(); // At line 3
B. new Inner(); // At line 8
C. new o.Inner(); // At line 8
D. new Outer.Inner(); // At line 8

2.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: littledeer1974 Posted on: 2004-12-21 17:11 没多想,觉得是B

3.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: zerol Posted on: 2004-12-21 17:51 A is correct. B is wrong because we shall get an Outer object to instance an Inner Object in a static method: o. new Inner();

4.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: chenyajun5 Posted on: 2004-12-21 17:55 A是正确的。。

5.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: j2ee8000 Posted on: 2004-12-21 23:38 去看一下<THINK IN JAVA>里面有写啦，你给出的好像没有对的正确的应该是:outclass.inner i=p.new inner();i内部类的对象名,p为外部类的对象名

6.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: j2ee8000 Posted on: 2004-12-21 23:42 刚才上面的话有点误，i内部类要创建的对象，p为外部类的对象，这样应该好明白一点!

7.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: prettyxx Posted on: 2004-12-22 13:36 感觉和j2ee8000 一样

8.Re:内部类与外部类的问题？ [Re: chenyajun5]	Copy to clipboard
Posted by: sc Posted on: 2004-12-22 17:13 在类的static method里面不能调用非static method.所以B是错的。而C,D中Inner前面的是包名，显然，Inner不属于这些个包，所以也是错的。