在java中将大文件加载到arraylist的最佳方法 [英] Best way to load a large file into arraylist in java

问题描述

我有一个大小约为300mb的文件。我想逐行读取内容，然后将其添加到ArrayList中。所以我创建了一个数组列表a1的对象，然后使用BufferedReader读取文件，之后当我将文件中的行添加到ArrayList中时，它在线程main中给出错误异常java.lang.OutOfMemoryError：Java堆空间。

I have a file whose size is about 300mb. I want to read the contents line by line and then add it into ArrayList. So I have made an object of array list a1 , then reading the file using BufferedReader , after that when I add the lines from file into ArrayList it gives an error Exception in thread "main" java.lang.OutOfMemoryError: Java heap space.

请告诉我这个解决方案应该是什么。

Please tell me what should be the solution for this.

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    try {
      FileReader file = new FileReader(
          "/home/dmdd/Desktop/AsiaData/RawData/AllupperairVcomponent.txt");
      ArrayList a1 = new ArrayList();
      BufferedReader br = new BufferedReader(file);
      String line = "";
      while ((line = br.readLine()) != null) {
        a1.add(line);
      }
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
  }

推荐答案

增加Java的堆大小

java -Xmx250m

java -Xmx250m

如果从IDE set -Xmx250m运行项目参数。

If you running your project from IDE set -Xmx250m in arguments.

250m是250mb

250m is 250mb

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