title: How can we replace tab character with white space for existing Java code in Eclipse?
body: <p>I am using Eclipse - mars. I need to replace tab character with white spaces in existing code. I did this:</p>
  
  <pre><code>Open Window-&gt;Preferences from menu bar.
  Select Text Editors from tree menu.
  Uncheck Insert spaces for tabs.
  </code></pre>
  
  <p>But this doesn't replace for existing code. Is there any simple way to do that, considering I have some 25 java files to do this.</p>