Question

将一个TEXT文件倒序，用JAVA怎样做

如题，首先要的是效率

Answer 1

将那个text文件用流读进来，然后拆分装进string型数组中，然后用for循环倒叙到另一个空数组中，最后把倒序完的数组写入text文件里。

Answer 2

package cn.rain.demo;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;

public class IO {

private RandomAccessFile raf;

public void getTxt(){
try {
raf = new RandomAccessFile("F:\\rain.txt", "rw");
int lenth = (int) raf.length();
ByteBuffer bb = ByteBuffer.allocate(lenth);

raf.getChannel().read(bb);
byte[] str = new byte[lenth];
str = bb.array();

byte[] strChanged = new byte[lenth];

for(int i = 0; i < lenth; i++)
{
strChanged[i] = str[lenth - 1 - i];
}

System.out.print(new String(strChanged));
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
IO io = new IO();
io.getTxt();
}

}