n = fis.read 里的n到底是啥意思

import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; /** * Created by liu_changshi on 2019/4/25. */ public class fileInputStreamTest { public static void main(String[] args) { try { FileInputStream fis = new FileInputStream("speech.txt"); int n = 0; int i = 0; try { while((n=fis.read())!=-1){ i++; System.out.println(n); } System.out.println(i); fis.close(); } catch (IOException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } } } 输出结果是 这里我没用char 读入的字节总数是什么意思呢 读取的过程是怎么样的呢 113 119 101 114 116 121 117 105 111 112 97 115 100 102 103 104 106 107 108 122 120 99 118 98 110 109 26