title: how to read data from byte array from java
body: <p>hi all
  i convert a mp3 file into byte array and i read from byte array but it shows null pointer exception on line number 15
  my code:</p>
  
  <pre><code>public class MainClass {
   static byte[] bytesarray = null;
    public static void main(String args[]){
   try {
  
      FileInputStream fis=new FileInputStream("D:\\taxi.mp3");
      try {
          fis.read(bytesarray,0,32);
          System.out.println(bytesarray.length);
      } catch (IOException e) {
          e.printStackTrace();
      }
  } catch (FileNotFoundException e) {
      e.printStackTrace();
  }
  
  
  
  ByteArrayInputStream in = new ByteArrayInputStream(bytesarray);     
  for (int i=0; i&lt;32; i++) {
      int c;
      while ((c = in.read()) != -1) {
      if (i == 0) {
      System.out.print((char) c);
      } else {
      System.out.print(Character.toUpperCase((char) c));
      }
      }
      System.out.println();
  
      } 
  </code></pre>
  
  <p>}
  }</p>