java - 不确定Java中变量的默认初始化

Question

这个问题已经有答案了:

已关闭 11 年前。

Possible Duplicate:
Uninitialized variables and members in Java
Why are local variables not initialized in Java?

在 Java变量有默认值，对吗？甚至数组也是由编译器初始化的。
所以我无法理解以下内容:

int c;  
for(int i = 0; i < 10; i++){  
   c = i + 5;  
}  
System.out.println("Result = "+c);  

为什么我会收到编译器错误:

The local variable c may not have been initialized

不是 c初始化为0编译器默认？
那么为什么我会收到此错误以及为什么如果我明确执行 int c = 0 错误就会消失？

Answer 1

否局部变量必须初始化，类字段变量有默认值

Local variables are slightly different; the compiler never assigns a default value to an uninitialized local variable. If you cannot initialize your local variable where it is declared, make sure to assign it a value before you attempt to use it. Accessing an uninitialized local variable will result in a compile-time error [...]