java对于需要在50多个excel文件上运行并且每个文件平均包含25k行的项目，最佳的方法是什么

Question

对于需要操作50多个excel文件且每个文件平均包含25k行的项目，最佳方法是什么

项目说明： 我必须加载数据（每个文件中有3列）并将它们存储在数组中，然后将它们用于不同的计算。我正在使用poi库处理excel文件。当我尝试加载数据时，出现了一个错误：线程“main”java中出现异常。lang.OutOfMemoryError:超出GC开销限制

让我知道避免GC开销错误的方法

import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;

import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;

public class Main {
    Date date;
    static int temp = 0;

    static ArrayList<User> userlist = new ArrayList<User>();

    public static void main(String[] args) throws EncryptedDocumentException, InvalidFormatException, IOException, ParseException {
        File f = new File("C:\\Users\\Shiva\\Downloads\\ISEC\\IS");
        System.out.println(f.list().length);
        int count = 0;
        for (File file : f.listFiles()) {
            if (file.isFile()) {
                count++;
                userlist.add(new User());
                String SAMPLE_XLSX_FILE_PATH = file.getAbsolutePath();
                Workbook workbook = WorkbookFactory.create(new File(SAMPLE_XLSX_FILE_PATH));
                Sheet sheet = workbook.getSheetAt(0);
                int[] oct = new int[sheet.getLastRowNum()];
                int[] dur = new int[sheet.getLastRowNum()];
                long[] frstrealpt = new long[sheet.getLastRowNum()];
                Iterator<Row> rowIterator = sheet.rowIterator();
                int z = 0;
                while (rowIterator.hasNext()) {
                    Row row = rowIterator.next();
                    if (row.getRowNum() == 0) {
                        continue; //just skip the rows if row number is 0
                    }
                    Cell pkts = row.getCell(2);
                    Cell octets = row.getCell(3);
                    oct[z] = (int) octets.getNumericCellValue();

                    Cell duration = row.getCell(9);
                    dur[z] = (int) duration.getNumericCellValue();

                    Cell realfrstpkt = row.getCell(6);
                    frstrealpt[z] = (long) realfrstpkt.getNumericCellValue();


                    z++;

                }
                System.out.println(oct.length);


            }

        }

        System.out.println(userlist.size());


    }

}