java：24G文件写入所要时间23.9分，读取只有67秒（1G内存测试）

package arrays.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class WriteFile {
 public static void main(String[] args) {
  String path = "d:/data.txt";
  writerFile(path);
  readerFile(path);
 }

 // 写入文件
 public static void writerFile(String path) {
  try {
   BufferedWriter bw = new BufferedWriter(new FileWriter(path));

   // int max = Integer.MAX_VALUE;
   int max = 1000;
   System.out.println("总写入文件行数：" + max);
   long start = System.currentTimeMillis();

   for (int i = 0; i < max; i++) {
    bw.write((int) (Math.random() * max) + "");
    bw.newLine();
   }

   bw.close();

   long end = System.currentTimeMillis();
   System.out.println("写入耗时：" + (end - start) + "ms = "
     + ((double) (end - start) / 1000) + "s");
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 // 读取文件
 public static void readerFile(String path) {
  try {
   BufferedReader br = new BufferedReader(new FileReader(path));

   long start = System.currentTimeMillis();

   while (br.ready()) {
    br.readLine();
   }

   br.close();

   long end = System.currentTimeMillis();
   System.out.println("读取耗时：" + (end - start) + "ms = "
     + ((double) (end - start) / 1000) + "s");
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 // 分割文件
 public static void splitFile() {

 }

}