Question

JAVA中怎样将系统文件与JTree连接起来

Answer 1

一、jtree用法如下：
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;

public class TreeDemo {
public static void main(String[] args) {

// 创建没有父节点和子节点、但允许有子节点的树节点，并使用指定的用户对象对它进行初始化。
// public DefaultMutableTreeNode(Object userObject)
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("软件部");
node1.add(new DefaultMutableTreeNode(new User("小花")));
node1.add(new DefaultMutableTreeNode(new User("小虎")));
node1.add(new DefaultMutableTreeNode(new User("小龙")));

DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("销售部");
node2.add(new DefaultMutableTreeNode(new User("小叶")));
node2.add(new DefaultMutableTreeNode(new User("小雯")));
node2.add(new DefaultMutableTreeNode(new User("小夏")));

DefaultMutableTreeNode top = new DefaultMutableTreeNode("职员管理");

top.add(new DefaultMutableTreeNode(new User("总经理")));
top.add(node1);
top.add(node2);
final JTree tree = new JTree(top);
JFrame f = new JFrame("JTreeDemo");
f.add(tree);
f.setSize(300, 300);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 添加选择事件
tree.addTreeSelectionListener(new TreeSelectionListener() {

@Override
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree
.getLastSelectedPathComponent();

if (node == null)
return;

Object object = node.getUserObject();
if (node.isLeaf()) {
User user = (User) object;
System.out.println("你选择了：" + user.toString());
}

}
});
}
}

class User {
private String name;

public User(String n) {
name = n;
}

// 重点在toString，节点的显示文本就是toString
public String toString() {
return name;
}
}