GUI Tree components, tables

The tree component first needs a new jtree, and then adds nodes to the JScrollPane.

JTree tree1=New  jtree (); // ....... Add a node Add (new ScrollPane (TREE1)

Adding nodes

Defaultmutabletreenode root=New defaultmutabletreenode ("Dongxi")// followed by notes Defaultmutabletreenode root=New defaultmutabletreenode (new Good ("AA", 11)); // It can also be used as a leaf new object

Add a monitor (added by the tree)

Addtreeselectionlistener (Treeselectionlistener Listener)

Method of Treeselectionlistener interface

 Public void valuechanged (treeselectionevent e)

In the above interface method, returns the node of the tree and returns the object in the node.

Defaultmutabletreenode node1= (Defaultmutabletreenode) tree.getlastselectedpathcomponent (); // only tree trees can use it. if (Node.isleaf ()) // determine if the leaf node Obeject a= (Obeject) node.getuserobject ()// return the object inside the leaf

Complete test Code

 Public classtest{ Public Static voidMain (String args[]) {Mywin Window1=NewMywin (); Window1.setbounds (12,12,400,300); }}classMywinextendsJFrameImplementstreeselectionlistener{JTextField Text1;    JButton Button1,button2;    JTextArea textarea1,textarea2;    JLabel Label1;    JTree tree1;        Mywin () {init (); SetVisible (true);    Setdefaultcloseoperation (Jframe.exit_on_close); }    voidinit () {Defaultmutabletreenode root=NewDefaultmutabletreenode ("Goods"); Defaultmutabletreenode Nodetv=NewDefaultmutabletreenode ("TV"); Defaultmutabletreenode Nodephone=NewDefaultmutabletreenode ("Phone"); Defaultmutabletreenode TV1=NewDefaultmutabletreenode (NewGoods ("Huangtv", 11)); Defaultmutabletreenode TV2=NewDefaultmutabletreenode (NewGoods ("Yutv", 21)); Defaultmutabletreenode Phone1=NewDefaultmutabletreenode (NewGoods ("Ga", 31)); Defaultmutabletreenode Phone2=NewDefaultmutabletreenode (NewGoods ("Bing", 11));        Root.add (NODETV);        Root.add (Nodephone);        Nodetv.add (TV1);        Nodetv.add (TV2);        Nodephone.add (PHONE1);        Nodephone.add (Phone2); Tree1=NewJTree (root); Tree1.addtreeselectionlistener ( This); SetLayout (NewGridLayout ()); Add (NewJScrollPane (tree1)); TEXTAREA2=NewJTextArea (15,15); Add (NewJScrollPane (TEXTAREA2)); }     Public voidvaluechanged (treeselectionevent e) {Defaultmutabletreenode a=(Defaultmutabletreenode) tree1.getlastselectedpathcomponent (); if(A.isleaf ()) {//is it a leaf node? Goods b=(Goods) a.getuserobject (); Textarea2.append (B.name+ ":" +b.price+ "\ n"); }        ElseTextarea2.settext (NULL); }}classgoods{String name; DoublePrice ; Goods (String name,DoublePrice ) {         This. name=name;  This. price=Price ; }}

GUI Tree components, tables