北大青鸟S1JAVA第十二章课后练习详解

package hierarchy; import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTree; import java.awt.*; import javax.swing.tree.*; public class HierarchyFrame extends JFrame { JPanel contentPane; BorderLayout borderLayout1 = new BorderLayout(); DefaultMutableTreeNode root = new DefaultMutableTreeNode("JComponent"); DefaultMutableTreeNode treJMenuBar = new DefaultMutableTreeNode("JMenuBar"); DefaultMutableTreeNode treJPopupMenu = new DefaultMutableTreeNode("JPopupMenu"); DefaultMutableTreeNode treJAbstractButton = new DefaultMutableTreeNode("JAbstractButton"); DefaultMutableTreeNode treSeparator = new DefaultMutableTreeNode("JSeparator"); DefaultMutableTreeNode treJMenuItem = new DefaultMutableTreeNode("JMenuItem"); DefaultMutableTreeNode treJMenu = new DefaultMutableTreeNode("JMenu"); DefaultMutableTreeNode treJCheckboxMenuItem = new DefaultMutableTreeNode("JCheckboxMenuItem"); DefaultMutableTreeNode treJRadioButtonMenuItem = new DefaultMutableTreeNode("JRadioButtonMenuitem"); JTree treHierarchy; public HierarchyFrame() { try { setDefaultCloseOperation(EXIT_ON_CLOSE); jbInit(); } catch (Exception exception) { exception.printStackTrace(); } } /** * Component initialization. * * @throws java.lang.Exception */ private void jbInit() throws Exception { contentPane = (JPanel) getContentPane(); contentPane.setLayout(borderLayout1); setSize(new Dimension(400, 300)); setTitle("Java 类"); treHierarchy = new JTree(root); root.add(treJMenuBar); root.add(treJPopupMenu); root.add(treJAbstractButton); root.add(treSeparator); treJAbstractButton.add(treJMenuItem); treJMenuItem.add(treJMenu); treJMenuItem.add(treJCheckboxMenuItem); treJMenuItem.add(treJRadioButtonMenuItem); contentPane.add(treHierarchy, java.awt.BorderLayout.CENTER); contentPane.add(treHierarchy); } }