title: Java read into byte array
body: <p>I have a .txt file consisting of 1's and 0's like so;</p>
  
  <pre><code>11111100000001010000000101110010
  11111100000001100000000101110010
  00000000101001100010000000100000
  </code></pre>
  
  <p>I would like to be able to read 8 (1's and 0's) and put each 'byte' into a byte array. So a line would be 4 bytes;</p>
  
  <pre><code>11111100 00000101 00000001 01110010 --&gt; 4 bytes, line 1
  11111100 00000110 00000001 01110010 --&gt; 8 bytes, line 2
  00000000 10100110 00100000 00100000 --&gt; total 12 bytes, line 3
                  ...
  and so on.
  </code></pre>
  
  <p>I believe I need to store the data in a binary file but I'm not sure how to do this. Any help is greatly appreciated.</p>
  
  <p>Edit 1:</p>
  
  <p>I would like to put 8 1's and 0's (11111100, 00000101) into a byte and store in a byte array so 11111100 would be the first byte in the array, 00000101 the second and so on. I hope this is clearer.</p>
  
  <p>Edit 2:</p>
  
  <pre><code>fileopen = new JFileChooser(System.getProperty("user.dir") + "/Example programs"); // open file from current directory
          filter = new FileNameExtensionFilter(".txt", "txt");
          fileopen.addChoosableFileFilter(filter);
  
          if (fileopen.showOpenDialog(null)== JFileChooser.APPROVE_OPTION) 
          {
              try
              {
                  file = fileopen.getSelectedFile();
  
                  //create FileInputStream object
                  FileInputStream fin = new FileInputStream(file);
  
                  byte[] fileContent = new byte[(int)file.length()];
  
                  fin.read(fileContent);
  
                  for(int i = 0; i &lt; fileContent.length; i++)
                  {
                      System.out.println("bit " + i + "= " + fileContent[i]);
                  }
  
                  //create string from byte array
                  String strFileContent = new String(fileContent);
                  System.out.println("File content : ");
                  System.out.println(strFileContent);                      
  
              }
              catch(FileNotFoundException e){}
              catch(IOException e){}
          }
  </code></pre>