题目：编写一个Java应用程序，利用RandomAccessFile类，把几个int型整数（1，2，3，4，5，6，7，8，9，10）写入到一个名字为tom.dat文件中，然后按相反顺序读出这些数据并显示在屏幕上
程序源代码是这样的：
import java.io.*;
class test3
{
public static void main(String args[]) throws IOException
{
RandomAccessFile r=new RandomAccessFile("tom.dat","rw");
for (int i=1;i<=10;i++)
r.writeInt(i);
for(long position=r.length()-4;position>=0;position=position-4)
{
r.seek(position);
System.out.print(r.readInt()+"\t");
}
r.close();
}
}
但是这一段我看了很久都看不懂
for(long position=r.length()-4;position>=0;position=position-4)
{
r.seek(position);
System.out.print(r.readInt()+"\t");
}
求各位大虾帮我解析一下，或者还有没有其他更简单的方法？
------解决方案--------------------------------------------------------
x86 sizeof(int) = 4 bytes
------解决方案--------------------------------------------------------
- Java code
Java code服务端import java.net.*;import java.io.*;import java.util.*;class fanserver{ static List<fanclient> client = new ArrayList<fanclient>(); public static void main(String[] args)throws Exception { Socket s; ServerSocket ss = new ServerSocket(4445); while(true){ s = ss.accept(); System.out.println("haha..."); server ser = new server(s); new Thread(ser).start(); client.add(ser); } /* BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); BufferedWriter bwout = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); BufferedReader brin = new BufferedReader(new InputStreamReader(s.getInputStream())); String str = null; while((str=brin.readLine())!=null){ // System.out.println(str); bwout.write(str); bwout.flush(); bwout.newLine(); } */ // s.shutdownOutput(); }}class server implements Runnable{ private Socket s; server(Socket s){ this.s = s; } public void run(){ try{ BufferedWriter bwout = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); BufferedReader brin = new BufferedReader(new InputStreamReader(s.getInputStream())); String str = null; while((str=brin.readLine())!=null){ System.out.println(str); bwout.write(str); bwout.newLine(); bwout.flush(); } // s.shutdownOutput(); } catch(Exception e){} }}Java code客户端import java.net.*;import java.io.*;class fanclient { public static void main(String[] args)throws Exception { Socket s = new Socket("192.168.30.129",4445); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); BufferedWriter bwout = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); BufferedReader brin = new BufferedReader(new InputStreamReader(s.getInputStream())); new Thread(new client(brin)).start(); String str = null; while((str=br.readLine())!=null){ bwout.write(str); bwout.newLine(); bwout.flush(); } // s.shutdownOutput(); // String line = brin.readLine(); // System.out.println(line); }}class client implements Runnable{ private BufferedReader brin; client(BufferedReader brin) { this.brin = brin; } public void run(){ String line = null; try{ while((line=brin.readLine())!=null){ System.out.println(line); } }catch(Exception e){} }}我同时启动好几个客户端，想让客户端通过服无端互相接收到信息，怎么处理，