import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class Demo {
    public static void main(String[] args) throws IOException{
        Demo demo = new Demo();
	demo.go("E:\\testdata\\directory1\\text1.txt");
    }
    public void go (String fn) throws IOException{
        if(! (new File(fn)).exists()) {
            IOException ioe = new IOException("文件不存在");
	    throw (ioe);
        }else {
	    FileInputStream fis = new FileInputStream(fn);
	    fis.read();
    	    int aa;
	    int bb = 1;
	    while((aa = fis.read()) != -1) {
		if((bb++ % 10) == 0) {
		    System.out.println();
		}
		if(aa <= 0xF) {
		    System.out.print(0);
	        }
	        System.out.print(Integer.toHexString(aa) + ",");
	    }
	    fis.close();
        }
    }
}

代码是这样写的，文件text1.txt中的内容是：There is a very beautiful city called Loulan,which locates in the west of ancient China.，输出结果却是：

68,65,72,65,20,69,73,20,61,

20,76,65,72,79,20,62,65,61,75,

74,69,66,75,6c,20,63,69,74,79,

20,63,61,6c,6c,65,64,20,4c,6f,

75,6c,61,6e,2c,77,68,69,63,68,

20,6c,6f,63,61,74,65,73,20,69,

6e,20,74,68,65,20,77,65,73,74,

20,6f,66,20,61,6e,63,69,65,6e,

74,20,43,68,69,6e,61,2e,

为何第一行提前了一下？