Swing Java Tutorial

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import javax.swing.JTree;
import javax.swing.tree.TreePath;
public class Main {
  public static void main(String[] argv) {
    JTree tree = new JTree() {
      protected void setExpandedState(TreePath path, boolean state) {
        if (state) {
          super.setExpandedState(path, state);
        }
      }
    };
  }
}