title: Concatenating elements in an array to a string
body: <p>I'm confused a bit. I couldn't find the answer anywhere ;(</p>
  
  <p>I've got an String array:</p>
  
  <pre><code>String[] arr = ["1", "2", "3"];
  </code></pre>
  
  <p>then I convert it to a string by:</p>
  
  <pre><code>String str = Arrays.toString(arr);
  System.out.println(str);
  </code></pre>
  
  <p>I expected to get the string <code>"123"</code>, but I got the string <code>"[1,2,3]"</code> instead.</p>
  
  <p>How could I do it in java? I'm using Eclipse IDE </p>