谁能知道实时Java树的编码?

问题描述

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;

public class MainClass {

  public static void main(String[] a) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(new JTreeEvents());
    f.setSize(500, 500);
    f.setVisible(true);
  }
}

class JTreeEvents extends JPanel {
  JTree tree;

  JTextField jtf;

  public JTreeEvents() {
    setLayout(new BorderLayout());
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

    DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
    top.add(a);
    
    a.add(new DefaultMutableTreeNode("A1"));
    a.add(new DefaultMutableTreeNode("A2"));

    DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
    top.add(b);
    
    b.add(new DefaultMutableTreeNode("B1"));
    b.add(new DefaultMutableTreeNode("B2"));
    b.add(new DefaultMutableTreeNode("B3"));

    tree = new JTree(top);

    int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
    int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    JScrollPane jsp = new JScrollPane(tree, v, h);

    add(jsp, BorderLayout.CENTER);

    jtf = new JTextField("", 20);
    add(jtf, BorderLayout.SOUTH);

    tree.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        doMouseClicked(me);
      }
    });
  }

  void doMouseClicked(MouseEvent me) {
    TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
    if (tp != null)
      jtf.setText(tp.toString());
    else
      jtf.setText("");
  }
}

在上面的编码中，我们给出了输入并获得了相同的输出.

但就我而言，我在网站上输入的内容必须采用这种树状形式.

现在就像
例如:
如果我输入为:

A2
A3
A1
B3
B1
B2

它给出的输出没有树形形式相同
A2
A3
A1
B3
B1
B2

有人可以知道实时Java树的编码吗?

In this above coding, we gave the input and get the same output.

but in my case ,what i have given in my website input that must be in tree form like this.

now it is like
for eg:
If i gave the input as:

A2
A3
A1
B3
B1
B2

it gives the output as same without tree form
A2
A3
A1
B3
B1
B2

Can anyone know the coding for real time java tree?

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