?? jtree2.java
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import java.awt.*;import javax.swing.*;import javax.swing.tree.*;import java.awt.event.*;import javax.swing.event.*;public class JTree2 extends JFrame{ JPanel cp=new JPanel(); JTree jtree; DefaultMutableTreeNode root; public JTree2() { this.setSize(300,300); this.setTitle("try to use tree"); cp=(JPanel)this.getContentPane(); cp.setLayout(new BorderLayout()); root=new DefaultMutableTreeNode("school"); createTree(root); jtree=new JTree(root); cp.add(jtree,BorderLayout.CENTER); } public static void main(String[] args) { JTree2 JTree2 = new JTree2(); JTree2.setVisible(true); } private void createTree(DefaultMutableTreeNode root) { DefaultMutableTreeNode classroom=null; DefaultMutableTreeNode number=null; classroom=new DefaultMutableTreeNode("classroom"); root.add(classroom); for(int i=1;i<=8;i++) { number=new DefaultMutableTreeNode("No."+String.valueOf(i)); if(i==4) { for(int j=1;j<=5;j++) { number.add(new DefaultMutableTreeNode("seat"+String.valueOf(j))); } } classroom.add(number); } } protected void processWindowEvent(WindowEvent e) { if(e.getID()==WindowEvent.WINDOW_CLOSING) { System.exit(0); } }}?? 快捷鍵說明
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