IO读取一个文本(字节、字符)中从最后一个开始读到第一个

			package IO_class.work;
import org.junit.Test;
import java.io.*;
public class Demo02 {
    //读取一个文本中从最后一个开始读到第一个
    //读取字节
    @Test
    public void method() throws Exception {
    //
        RandomAccessFile rf = new RandomAccessFile("io0.txt","r");
        //用for循环字节长度减一
        for (long i = rf.length()-1; i >=0 ; i--) {
            Thread.sleep(1000);
            //偏移量从最后向前移动
            rf.seek(i);
            int read =rf.read();
            System.out.println((char) read);
            //获取偏移量值
            long fp = rf.getFilePointer();
            System.out.println("偏移量："+fp);
        }
        rf.close();
    }
	//读取字符
    @Test
    public void method1() throws Exception {
        RandomAccessFile rf = new RandomAccessFile("io3.txt","r");
        byte[] b = new byte[3];
        int read;
        //RandomAccessFile rd = new RandomAccessFile("","rw");
        //利用for循环每一次减三个字节
        for (long i = rf.length()-3; i >=0 ; i-=3) {
            Thread.sleep(100);
            rf.seek(i);
            read =rf.read(b);
            System.out.println(new String(b,0,read));
            long fp = rf.getFilePointer();
            System.out.println("偏移量："+fp);
        }
        rf.close();
    }
}