不明白 数组B是怎么读取到内容的？

Question

public void Text2() throws IOException{    long start = System.currentTimeMillis();    FileInputStream file = new FileInputStream("D:\\Text\\遍历目录\\FileTest.java");    byte[] b = new byte[20*1024];    int bytes = file.read(b,0,b.length);    int a = 1;    for(int i=0; i<bytes; i++){      if(b[i] <= 0xf)        System.out.print(0);      System.out.print(Integer.toHexString(b[i])+" ");      if(a++ % 10 == 0)       System.out.println();    }

Answer 1

通过文件输入流的read方法，你可以具体查下read方法的api