JTree Common methods

 PackageCom.swing.demo;Importjava.awt.Component;ImportJava.awt.event.MouseAdapter;Importjava.awt.event.MouseEvent;Importjava.util.ArrayList;Importjava.util.Enumeration;Importjava.util.List;ImportJavax.swing.JFrame;ImportJavax.swing.JScrollPane;ImportJavax.swing.JTree;Importjavax.swing.SwingUtilities;Importjavax.swing.event.TreeExpansionEvent;ImportJavax.swing.event.TreeExpansionListener;Importjavax.swing.event.TreeSelectionEvent;ImportJavax.swing.event.TreeSelectionListener;ImportJavax.swing.tree.DefaultMutableTreeNode;ImportJavax.swing.tree.DefaultTreeCellRenderer;ImportJavax.swing.tree.DefaultTreeModel;ImportJavax.swing.tree.TreeNode;ImportJavax.swing.tree.TreePath;ImportJavax.swing.tree.TreeSelectionModel;ImportCom.swing.model.User;/*** JTree Common methods. *@authorAdministrator **/ Public classTreedemo { Public Static voidMain (string[] args) {FinalJTree tree =Createtree (); //form SettingsJFrame frame =NewJFrame ("Jtreedemo"); //after the construction of the tree will also put the tree on the Jscollpanel, or the tree will show a problemJScrollPane TreeView =NewJScrollPane (tree);        Frame.add (TreeView); Frame.setsize (300, 300); Frame.setvisible (true);        Frame.setdefaultcloseoperation (Jframe.exit_on_close); //Add tree node Select eventTree.addtreeselectionlistener (NewTreeselectionlistener () {@Override Public voidvaluechanged (treeselectionevent e) {//Get TreePath//TreePath NewPath = Event.getnewleadselectionpath (); //TreePath OldPath = Event.getoldleadselectionpath (); //get node through JTree//JTree tree = (jtree) event.getsource (); //tree.getlastselectedpathcomponent ();Defaultmutabletreenode node =(Defaultmutabletreenode) tree. getlastselectedpathcomponent (); if(node = =NULL) {                    return; } Object Object=Node.getuserobject (); if(Node.isleaf ()) {User User=(User) object; System.out.println ("You have chosen:" +user.tostring ()); }                //Get root node:TreeNode RootNode =(TreeNode) Tree.getmodel (). Getroot (); //get the data model of the tree:Defaulttreemodel TreeModel =(Defaulttreemodel) Tree.getmodel (); //get the location of a node of a tree:TreePath Nodepath =NewTreePath (Treemodel.getpathtoroot (node)); //to set the expansion selection and visibility of a node:Tree.setselectionpath (Nodepath);                Tree.makevisible (Nodepath); //expand and scroll to the node visible:tree.scrollpathtovisible (Nodepath); //Another is to set the mouse click to expand the tree node (the default is double-clicked, changed to 0 is not clickable):Tree.settoggleclickcount (1); //The other is a set cell height, but this method we generally do not, most of the time is set in the renderer, because this setting may have UI problems://Tree.setrowheight (a);            }        }); //tree node expand (collapse) eventTree.addtreeexpansionlistener (NewTreeexpansionlistener () {@Override Public voidtreeexpanded (Treeexpansionevent event) {} @Override Public voidtreecollapsed (Treeexpansionevent event) {}}); Tree.addmouselistener (NewMouseadapter () {@Override Public voidmouseclicked (MouseEvent e) {if(Swingutilities.isleftmousebutton (e)&& E.getclickcount () = = 1) {                    //Returns The last path componentDefaultmutabletreenode node =(Defaultmutabletreenode) tree. getlastselectedpathcomponent (); } Else if(Swingutilities.isrightmousebutton (e)) {//Returns The row for the specified location. //int selectrow = tree.getrowforlocation (E.getx (),//e.gety ()); //Returns The path for the node at the specified location.TreePath Selectpath =tree.getpathforlocation (E.getx (), e.gety ()); if(Selectpath! =NULL) {                        //Set SelectTree.setselectionpath (Selectpath); //get tree node.Defaultmutabletreenode TreeNode =(Defaultmutabletreenode) Selectpath. Getlastpathcomponent ();        }                }            }        }); //rendererTree.setcellrenderer (NewDefaulttreecellrenderer () {/*** Serialversionuid*/            Private Static Final LongSerialversionuid = 1L; @Override PublicComponent gettreecellrenderercomponent (jtree tree, Object value,BooleanSelBooleanExpandedBooleanLeaf,intRowBooleanHasfocus) {                return Super. Gettreecellrenderercomponent (tree, value, sel, expanded, leaf, row, hasfocus);    }        }); }    /*** Createtree * *@return     */    Private StaticJTree Createtree () {//creates a tree node that has no parent and child nodes, but allows child nodes, and initializes it with the specified user object. //Public Defaultmutabletreenode (Object UserObject)Defaultmutabletreenode Node1 =NewDefaultmutabletreenode ("software Department"); Node1.add (NewDefaultmutabletreenode (NewUser ("Floret"))); Node1.add (NewDefaultmutabletreenode (NewUser ("Xiao Hu"))); Node1.add (NewDefaultmutabletreenode (NewUser ("Drake"))); Defaultmutabletreenode Node2=NewDefaultmutabletreenode ("Sales Department"); Node2.add (NewDefaultmutabletreenode (NewUser ("Leaflet"))); Node2.add (NewDefaultmutabletreenode (NewUser ("Xiao Wen"))); Node2.add (NewDefaultmutabletreenode (NewUser ("Little Summer"))); Defaultmutabletreenode Top=NewDefaultmutabletreenode ("Staff Management"); Top.add (NewDefaultmutabletreenode (NewUser ("General manager"))));        Top.add (Node1);        Top.add (Node2); //jtree (TreeNode root)//Returns a jtree that specifies the TreeNode as its root, which displays the root node. JTree tree =NewJTree (top); //The final JTree also sets the data through Setmodel://tree = new JTree (); //Tree.setmodel (TreeModel);Tree.getselectionmodel (). Setselectionmode (treeselectionmodel.single_tree_selection); returnTree; }    PrivateList<treenode> treenodelist =NewArraylist<treenode>(); /*** Recursively from any node with all the examples below. *      * @paramTreeNode*/     Public voidgetchildnodelist (TreeNode TreeNode) {if(TreeNode = =NULL) {            Throw NewRuntimeException ("Error TreeNode.")); }        if(Treenodelist = =NULL) {treenodelist=NewArraylist<treenode>(); }        if(Treenode.getchildcount () >= 0) {             for(Enumeration<treenode> e =Treenode.children (); E. hasmoreelements ();) {TreeNode Childnode=(TreeNode) e.nextelement ();                Treenodelist.add (Childnode);            Getchildnodelist (Childnode); }        }    }}

JTree Common methods