我的for循环中的java.lang.OutOfMemoryError [英] java.lang.OutOfMemoryError in my for loop

问题描述

我正在尝试获取列表的大小，但出现错误:

I'm trying to get the size of a list but I get the error:

Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError occurred dispatching signal UNKNOWN to handler- the VM may need to be forcibly terminated
Exception in thread "main"

这是我的代码:

public void wrapText(String text, int width)
  {
    List<String> items = new LinkedList<String>(Arrays.asList(text.split(" ")));
    for(int j = 0; j < items.size(); j++){
        items.add(width, "\n");
    }
    System.out.println(items);
    /* this method needs to be improved - it currently does not wrap text */
  //  System.out.println(text);
  }

我在做什么错了?

推荐答案

每次迭代时，您都在列表中添加了一个元素，因此增加了它的大小.在每次迭代结束时，j < items.size()总是等于true，将您的for变成无限循环，其调用堆栈最终将耗尽JVM的内存.

Every iteration, you are adding an element on your list, hence increasing it's size. At the end of each iteration, j < items.size() will always eval to true, turning your for into an infinite loop, which its call stack will eventually drain JVM's memory.

如果只想对列表的初始长度重复for循环，只需将该值保存到循环之前的变量中，然后使用它代替.size()

If you want to repeat your for loop only for the initial length of your list, just save that value into a variable prior to the loop and use that instead of .size()

int len = items.size();
for(int j = 0; j < len; j++){
    items.add(width, "\n");
}

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