内存不足使用扫描仪将大文件读入内存 [英] Out of memory using Scanner to read large file into memory

问题描述

当我将一个大文件传递给扫描仪时，以下代码块会引发 java.lang.OutOfMemoryError 异常.解决此问题的最佳方法是什么?是arraylist的问题还是scanner的问题?

The following block of code is throwing a java.lang.OutOfMemoryError exception when I pass a large file into the scanner. What is the best way to fix this? Is the problem in the arraylist or the scanner?

ArrayList rawData = new ArrayList();
Scanner scan = new Scanner(file);

while (scan.hasNext()) {
    String next = scan.next();
        rawData.add(next);
}

推荐答案

增加java堆大小，例如

Increase the java heap size, e.g.

java -Xmx6g myprogram

将堆大小设置为 6 GB.当然总会有限制的....

will set the heap size to 6 gigabytes. Of course there will always be a limit....

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