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我使用this教程製作JTree。 現在我想調用這個類並把它放在一個ScrollPane中。調用JTree並放入滾動條
但是當我使用這個
TreeMainMenu tree = new TreeMainMenu();
JScrollPane MainMenu = new JScrollPane(tree);
它只能得到默認的樹。我需要了解如何從另一個類中調用組件來使用它們。
的JTree:
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeSelectionModel;
public class TreeMainMenu extends JTree {
private DefaultMutableTreeNode top = new DefaultMutableTreeNode("TOP");
public TreeMainMenu() {
APNode();
JTree tree = new JTree(top);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
}
private void APNode() {
DefaultMutableTreeNode category = null;
DefaultMutableTreeNode node1 = null;
DefaultMutableTreeNode node2 = null;
DefaultMutableTreeNode node3 = null;
category = new DefaultMutableTreeNode("top");
top.add(category);
node1 = new DefaultMutableTreeNode(new Node("top-1"));
category.add(node1);
node2 = new DefaultMutableTreeNode(new Node("node1"));
node1.add(node2);
node2 = new DefaultMutableTreeNode(new Node("node2"));
node1.add(node2);
node2 = new DefaultMutableTreeNode(new Node("node3"));
node1.add(node2);
node2 = new DefaultMutableTreeNode(new Node("node4"));
node1.add(node2);
}
private class Node {
public String nodeName;
public Node(String node) {
nodeName = node;
}
public String toString() {
return nodeName;
}
}
}