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    <p>Try something like this:</p> <pre class="lang-java prettyprint-override"><code>public static CommonTree copyTree(CommonTree original) { CommonTree copy = new CommonTree(original.getToken()); copyTreeRecursive(copy, original); return copy; } private static void copyTreeRecursive(CommonTree copy, CommonTree original) { if(original.getChildren() != null) { for(Object o : original.getChildren()) { CommonTree originalChild = (CommonTree)o; // get the token from the original child node CommonToken oTok = (CommonToken)originalChild.getToken(); // create a new token with the same type &amp; text as 'oTok' CommonToken cTok = new CommonToken(oTok.getType(), oTok.getText()); // copy all attributes from 'oTok' to 'cTok' cTok.setLine(oTok.getLine()); cTok.setCharPositionInLine(oTok.getCharPositionInLine()); cTok.setChannel(oTok.getChannel()); cTok.setStartIndex(oTok.getStartIndex()); cTok.setStopIndex(oTok.getStopIndex()); cTok.setTokenIndex(oTok.getTokenIndex()); // create a new tree node with the 'cTok' as token CommonTree copyChild = new CommonTree(cTok); // set the parent node of the child node copyChild.setParent(copy); // add the child to the parent node copy.addChild(copyChild); // make a recursive call to copy deeper copyTreeRecursive(copyChild, originalChild); } } } ... // get the original tree CommonTree tree = (CommonTree)parser.parse().getTree(); // create a copy of the tree CommonTree copy = copyTree(tree); // change the contents of the right node of the right node of the root ((CommonTree)tree.getChild(1).getChild(1)).getToken().setText("X"); System.out.println(tree.toStringTree()); System.out.println(copy.toStringTree()); </code></pre> <p>which would produce:</p> <pre> (&& a (|| b X)) (&& a (|| b c)) </pre> <p>for the input <code>"a &amp;&amp; (b || c)"</code>. I.e., the <code>tree</code> has <code>X</code>, but the <code>copy</code> would will have the original contents: <code>c</code>.</p> <p>Note that I choose <code>CommonTree</code> and <code>CommonToken</code> objects because those are the default <code>Token</code> and <code>Tree</code> implementations. If you choose to create your own <code>Token</code> and/or <code>Tree</code>, chances are that you'll subclass the <code>CommonTree</code> and <code>CommonToken</code> classes, in which case my suggestion would not break.</p> <p>A <code>CommonTree</code> is nothing more than a wrapper around a <code>CommonToken</code>, holding a bit of extra information: a parent node, and child nodes. That is why I also copy all the information from the <code>CommonToken</code> objects.</p>
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