GC并在for循环中分配值 [英] GC and assigning values in a for loop

问题描述

我有个朋友告诉了我下面的情况，但是我不能给出一个很好的理由。

  someArray = ......... 
 int a; 
 for（int i = 0; i< someArray; i ++）{
 
 a = someArray.get（i）.length（）; 
 //做点什么
} 
  

他告诉我他宣布<$

我以为声明 a a 在for循环之外，以避免频繁的垃圾回收。 for循环中的更具可读性和线程安全性。然而，我不能不同意不同的实例 a 如果在for循环。

有什么建议吗？垃圾收集处理对象 。 你所拥有的是一个原始的局部变量 a 它将被分配到堆栈中。

<因此，这个问题的整个前提是错误的。

I have a friend who told me the following but I couldn't give a good reason why.

someArray =......... 
int a;
for(int i=0; i < someArray; i++) {

a=someArray.get(i).length();
   // Do something
} 

He told me that he declared a outside of the for loop in order to avoid frequent garbage collection.

I thought declaring a inside of the for loop is more readable and thread safe.

However I couldn't disagree that different instances a no of iteration will be garbage collected if it's declared inside of for loop.

Any advise for me?

解决方案

Garbage collection handles objects. What you have is a primitive local variable a which will be allocated on the stack.

Therefore the whole premise of this question is wrong.

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