请教scjp中的问题

[hejiehui]

有时候会有这样两种选项同时出现在供选择的答案中。比如一段代码：
class a{

}

[bsd]

I mean the compiler exit before it create a class file.
and the prompt is as following:
-----------
C:\src>javac testCompile.java
testCompile.java:4: 变量 a 可能还未被初始化
a=a+1;
^
1 个错误

C:\src>
------------

[cablink]

对于JAVA而言，局部变量在使用前一定要初始化，它没有缺省值，而是随机的。而实例变量有缺省值，可以不用

[hejiehui]

sorry,let's continue:

class a{
public static void main(String[] args){
int a;
a=a+1;
}
}
question:what will happen when compile this code?
.
.
.
D does not compile
E complile but throw a compile time error

the answer is E.can sb tell me what the difference between choise D and E

[hexiaofeng]

觉得E 回答的更好

[ye_zhy]

这样的程序会出现a未被初始化的错误

[ye_zhy]

而且用websphere是无法编译的

[bsd]

in JDK1.3
the answer may be D.
It does not compile.

[hejiehui]

bsd is right.the answe is D.sorry for the mistake i made.but what's your mean about "does not compile"?isn't the scaning of the code a behaviour or part of of compile

[hejiehui]

under what situation will the compiler exit before actually compile or what kind of error can be or can not be a compile time error.