最初の を作成しようとしていますJTree
が、ノードをツリーに追加しようとすると、変更が反映されず、表示されるのはいくつかのデフォルト ノード (色、スポーツ、食べ物) を持つツリーだけです。
ツリーが存在するメイン パネル コード:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
public class Scenario1Panel extends JPanel
{
/**
*
*/
private static final long serialVersionUID = 1L;
public Scenario1Tree scenario1Tree;
public Scenario1Panel()
{
scenario1Tree = new Scenario1Tree();
add(scenario1Tree);
}
public static void main(String args[])
{
try
{
String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
System.out.println(lookAndFeel);
UIManager.setLookAndFeel(lookAndFeel);
}
catch(Exception e)
{
System.out.println("couldn't get that LookAndFeel");
}
Scenario1Panel mgr = new Scenario1Panel();
JFrame frame = new JFrame();
frame.add(mgr);
frame.pack();
frame.setVisible(true);
}
}
私のツリーコードは次のとおりです。
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeSelectionModel;
public class Scenario1Tree extends JTree
{
/**
*
*/
private static final long serialVersionUID = 1L;
private JTree tree;
public Scenario1Tree()
{
DefaultMutableTreeNode top = new DefaultMutableTreeNode("Scenario1");
createNodes(top);
tree = new JTree(top);
//Create a tree that allows one selection at a time.
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
//Create the scroll pane and add the tree to it.
JScrollPane treeView = new JScrollPane(tree);
}
private void createNodes(DefaultMutableTreeNode top) {
DefaultMutableTreeNode loginUser1 = null;
DefaultMutableTreeNode addNewUsers = null;
DefaultMutableTreeNode addNewUsersBreakout = null;
loginUser1 = new DefaultMutableTreeNode("Login User 1");
top.add(logintUser1);
addNewUsers = new DefaultMutableTreeNode("Add New Users");
top.add(addNewUsers);
addNewUsersBreakout = new DefaultMutableTreeNode("Add User2");
addNewUsers.add(addNewUsersBreakout );
addNewUsersBreakout = new DefaultMutableTreeNode("Add User3");
addNewUsers.add(addNewUsersBreakout );
addNewUsersBreakout = new DefaultMutableTreeNode("Add User4");
addNewUsers.add(addNewUsersBreakout );
addNewUsersBreakout = new DefaultMutableTreeNode("Add User5");
addNewUsers.add(addNewUsersBreakout );
}
public static void main(String args[])
{
try
{
String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
System.out.println(lookAndFeel);
UIManager.setLookAndFeel(lookAndFeel);
}
catch(Exception e)
{
System.out.println("couldn't get that LookAndFeel");
}
Scenario1Tree tree = new Scenario1Tree();
JFrame frame = new JFrame();
frame.add(tree);
frame.pack();
frame.setVisible(true);
}
}
誰かが私が間違っていることを説明してもらえますか?