Java实现可折叠界面

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public class MainClass extends JPanel {

public static void main(String[] args) {

MutableTreeNode root = new DefaultMutableTreeNode("QQ好友");

MutableTreeNode aNode = new DefaultMutableTreeNode("我的好友");

MutableTreeNode bNode = new DefaultMutableTreeNode("陌生人");

MutableTreeNode cNode = new DefaultMutableTreeNode("黑名单");

(aNode, 0);

(bNode, 1);

(cNode, 2);

(new DefaultMutableTreeNode("friend_a"), 0);

(new DefaultMutableTreeNode("friend_b"), 1);

(new DefaultMutableTreeNode("stranger_a"), 0);

(new DefaultMutableTreeNode("stranger_b"), 1);

(new DefaultMutableTreeNode("black_a"), 0);

(new DefaultMutableTreeNode("black_b"), 1);

DefaultTreeModel model = new DefaultTreeModel(root);

JTree tree = new JTree(model);

JFrame frame = new JFrame("QQ");

(JFrame.EXIT_ON_CLOSE);

(new JScrollPane(tree),);

();

(true);

}

}