Java Swing中的表格(JTable)和树(JTree)组件使用实例(3)

public class JTreeDemo1 { 
     
    JFrame f;  
    Box box; 
    JTree jTree1,jTree2; 
     
    public JTreeDemo1() 
    { 
        f = new JFrame(" JTreeDemo1 "); 
        box = Box.createHorizontalBox(); //创建Box 类对象 
         
        jTree1 = new JTree(); 
        jTree2 = new JTree(); 
         
        //向此组件添加任意的键/值 
        jTree1.putClientProperty("JTree.lineStyle", "Angled");  
         
        //向Box 容器添加滚动面板 
        box.add(new JScrollPane(jTree1), BorderLayout.WEST); 
        box.add(new JScrollPane(jTree2), BorderLayout.EAST); 
         
        f.getContentPane().add(box, BorderLayout.CENTER); 
         
        f.setSize(300, 240); 
        //f.pack(); 
        f.setLocation(300, 200); 
        f.setVisible(true); 
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 
     
    public static void main(String[] args) { 
        new JTreeDemo1(); 
    } 
}

public class JTreeDemo2 { 
 
    JFrame f;  
    JPanel p;  
    JTree jTree1,jTree2,jTree3,jTree4,jTree5,jTree6,jTree7; 
     
    public JTreeDemo2() { 
         
        f = new JFrame(" JTreeDemo2 "); 
         
        // 构造函数：JTree() 
        jTree1 = new JTree(); 
         
        // 构造函数：JTree(Object[] value) 
        Object[] letters = { " a ", " b ", " c ", " d ", " e " }; 
        jTree2 = new JTree(letters); 
 
        // 构造函数：JTree(TreeNode root)(TreeNode空) 
        // 用空结点创建树 
        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode(); // 定义树结点 
        jTree3 = new JTree(node1); // 用此树结点做参数调用 JTree的构造函数创建含有一个根结点的树 
 
        // 构造函数：JTree(TreeNode root)(同上,只是TreeNode非空) 
        // 用一个根结点创建树 
        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode(" Color "); 
        jTree4 = new JTree(node2); // 结点不可以颜色,默认为白面黑字 
        jTree4.setBackground(Color.lightGray); 
 
         
        // 构造函数：JTree(TreeNode root, boolean 
        // asksAllowsChildren)(同上,只是TreeNode又有不同) 
        // 使用DefaultMutableTreeNode类先用一个根结点创建树，设置为可添加孩子结点,再添加孩子结点 
        DefaultMutableTreeNode color = new DefaultMutableTreeNode(" Color ", 
                true); 
         
        DefaultMutableTreeNode gray = new DefaultMutableTreeNode(" Gray "); 
        gray.add(new DefaultMutableTreeNode(" Lightgray ")); 
        gray.add(new DefaultMutableTreeNode(" Darkgray ")); 
         
        color.add(gray); 
         
        color.add(new DefaultMutableTreeNode(" Red ")); 
        color.add(new DefaultMutableTreeNode(" Green ")); 
 
        jTree5 = new JTree(color); 
 
         
        // 构造函数：JTree(TreeNode root)(同上,只是TreeNode非空) 
        // 通过逐个添加结点创建树 
        DefaultMutableTreeNode biology = new DefaultMutableTreeNode(" Biology "); 
        DefaultMutableTreeNode animal = new DefaultMutableTreeNode(" Animal "); 
        DefaultMutableTreeNode mammal = new DefaultMutableTreeNode(" Mammal "); 
        DefaultMutableTreeNode horse = new DefaultMutableTreeNode(" Horse "); 
        mammal.add(horse); 
        animal.add(mammal); 
        biology.add(animal); 
         
        jTree6 = new JTree(biology); 
        horse.isLeaf(); 
        horse.isRoot(); 
 
         
        // 构造函数:JTree(TreeModel newModel) 
        // 用DefaultMutableTreeNodel类定义一个结点再用这个结点做参数定义一个用DefaultTreeMode 
        // 创建一个树的模型,再用JTree的构造函数创建一个树 
        DefaultMutableTreeNode root = new DefaultMutableTreeNode(" Root1 "); 
        DefaultMutableTreeNode child1 = new DefaultMutableTreeNode(" Child1 "); 
        DefaultMutableTreeNode child11 = new DefaultMutableTreeNode(" Child11 "); 
        DefaultMutableTreeNode child111 = new DefaultMutableTreeNode( 
                " Child111 "); 
        root.add(child1); 
        child1.add(child11); 
        child11.add(child111); 
 
        DefaultTreeModel model = new DefaultTreeModel(root); 
 
        jTree7 = new JTree(model); 
 
         
        p = new JPanel(); 
        p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS)); 
        p.setPreferredSize(new Dimension(700, 400)); 
         
        // JTree必须放在JScrollPane上 
        p.add(new JScrollPane(jTree1));  
        p.add(new JScrollPane(jTree2)); 
        p.add(new JScrollPane(jTree3)); 
        p.add(new JScrollPane(jTree4)); 
        p.add(new JScrollPane(jTree5)); 
        p.add(new JScrollPane(jTree6)); 
        p.add(new JScrollPane(jTree7)); 
 
         
        f.setContentPane(p); 
        f.pack(); 
        f.setLocation(300, 200); 
        f.setVisible(true); 
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 
 
    public static void main(String[] args) { 
         
        new JTreeDemo2(); 
     
    } 
}