Use buffered input. : Buffer Stream « File Input Output « Java

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Java » File Input Output » Buffer StreamScreenshots 
Use buffered input.
 
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;

class BufferedInputStreamDemo {
  public static void main(String args[]) throws IOException {
    String s = "This is a © copyright symbol " "but this is &copy not.\n";
    byte buf[] = s.getBytes();
    ByteArrayInputStream in = new ByteArrayInputStream(buf);
    BufferedInputStream f = new BufferedInputStream(in);
    int c;
    boolean marked = false;

    while ((c = f.read()) != -1) {
      switch (c) {
      case '&':
        if (!marked) {
          f.mark(32);
          marked = true;
        else {
          marked = false;
        }
        break;
      case ';':
        if (marked) {
          marked = false;
          System.out.print("(c)");
        else
          System.out.print((charc);
        break;
      case ' ':
        if (marked) {
          marked = false;
          f.reset();
          System.out.print("&");
        else
          System.out.print((charc);
        break;
      default:
        if (!marked)
          System.out.print((charc);
        break;
      }
    }
  }
}

 
Related examples in the same category
1.Use BufferedInputStream and BufferedOutputStream to copy byte array
2.Writing to a Binary File
3.Reading from a Binary File with BufferedInputStream
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