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Allow only a single node to be selected (default)

import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.tree.TreeSelectionModel; public class TreeSingleSelection {   public static void main(String[] argv) {     JTree tree = new JTree();     tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);     JFrame frame = new JFrame("Tree single selection");     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     frame.add(new JScrollPane(tree));     frame.setSize(380, 320);     frame.setLocationRelativeTo(null);     frame.setVisible(true);   } }