第95題

Given:
1. interface TestA{String toString();}
2. public class Test{
3. public static void main(String[] args){
4. System.out.println(new TestA(){
5. public String toString(){return "test";}
6. });
7. }
8. }
What is the result?
A. test
B. null
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 1.
E. Compilation fails because of an error in line 4.
F. Compilation fails because of an error in line 5.
答案：A
參考：8-5 內部類別
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4. System.out.println(new TestA(){
5. public String toString(){return "test";}
6. }); //命名類別實做TestA的toString方法,所以在print時會列出test