swing快速入门（四十二）JTree的基本创建

news2024/12/27 9:43:57

注释很详细，直接上代码

新增内容

🔦JTree的创建

🔦设置节点之间的连线

🔦设置节点之间的水平分割线

🔦设置根节点的展开折叠图标

🔦设置是否隐藏根节点

package swing31_40;

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class swing_test_40 {
    JFrame jFrame = new JFrame("简单树");
    JTree tree;
    DefaultMutableTreeNode root;
    DefaultMutableTreeNode guangdong;
    DefaultMutableTreeNode guangxi;
    DefaultMutableTreeNode foshan;
    DefaultMutableTreeNode shantou;
    DefaultMutableTreeNode guilin;
    DefaultMutableTreeNode nanning;

    public void init(){
        //依次创建所有结点
        root = new DefaultMutableTreeNode("中国");
        guangdong = new DefaultMutableTreeNode("广东");
        guangxi = new DefaultMutableTreeNode("广西");
        foshan = new DefaultMutableTreeNode("佛山");
        shantou = new DefaultMutableTreeNode("汕头");
        guilin = new DefaultMutableTreeNode("桂林");
        nanning = new DefaultMutableTreeNode("南宁");


        //通过add()方法建立父子层级关系
        guangdong.add(foshan);
        guangdong.add(shantou);
        guangxi.add(guilin);
        guangxi.add(nanning);
        root.add(guangdong);
        root.add(guangxi);

        //依据根结点，创建JTree
        tree = new JTree(root);

        //设置结点之间没有连接线
        //tree.putClientProperty( "JTree.lineStyle", "None");

        //设置结点之间有水平分割线
        //tree.putClientProperty("JTree.lineStyle" , "Horizontal");

        //设置根结点有"展开、折叠"图标
        //tree.setShowsRootHandles(true);

        //隐藏根结点
        //tree.setRootVisible(false);

        //设置滚动
        jFrame.add(new JScrollPane(tree));
        
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗口
        jFrame.pack();//自动调整窗口大小
        jFrame.setVisible(true);//显示窗口

    }

    public static void main(String[] args) {
        //启动程序
        new swing_test_40().init();
    }
}