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