"SCJP 1.6版考題 095" 修訂間的差異
出自 陳富國維基館
(新頁面: 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()...) |
(無差異)
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於 2013年3月30日 (六) 05:52 的最新修訂
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.
解答
Ans: A
解說:
new TestA(){
public String toString(){return "test";}
}
此種寫法是建立物件時，立即提供介面方法toString的實作。
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