Question

Java 树形问题 很简单 在线等随时给分

现在有个树形结构图 在左 ... 然后 有个文本框 在右

当点击 右边的 树形节点的时候 左边文本框则显示 “软件设计”
当点击 右边的 树形根节点时 则不显示任何文字怎么弄 大概就是这个意思
树形赋值

Answer 1

不知下面这个例子是否会对你有所帮助。

import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class 处理树选取事件 extends JApplet {
JTree tree = new JTree();
JTextArea textArea = new JTextArea();
JSplitPane splitPane = new JSplitPane(
JSplitPane.HORIZONTAL_SPLIT,
new JScrollPane(tree),
new JScrollPane(textArea));
public void init() {
splitPane.setDividerLocation(150);
textArea.setFont(new Font("Serif", Font.PLAIN, 17));

getContentPane().add(splitPane, BorderLayout.CENTER);

tree.addTreeSelectionListener(
new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
TreePath path = e.getNewLeadSelectionPath();
String s = new String();

if(path != null) {
s += "New lead selection path: " +
path.toString() + "\n";
}
else
s += "selection cleared\n";

path = e.getOldLeadSelectionPath();

if(path != null) {
s += "Old lead selection path: " +
path.toString() + "\n";
}
else
s += "No previous lead selection\n";

textArea.append(s + "\n");
printSelectionInformation(e);
}
void printSelectionInformation(TreeSelectionEvent e) {
showPaths(e);
showRows();

textArea.append("\n----------------------------");
textArea.append("----------------------------\n");
}
private void showPaths(TreeSelectionEvent e) {
TreePath[] paths = e.getPaths();

textArea.append("Number of Paths: " +
paths.length + "\n");

for(int i=0; i < paths.length; ++i) {
TreePath path = paths[i];
boolean wasAdded = e.isAddedPath(path);

textArea.append(" path " + i + ": ");
textArea.append(path +
(wasAdded ? " added to selection" :
" removed from selection") + "\n");
}

}
private void showRows() {
int[] rows = tree.getSelectionRows();

if(rows != null && rows.length > 0) {
textArea.append("\nSelected Rows: ");

for(int i=0; i < rows.length; ++i) {
textArea.append(
Integer.toString(rows[i]));

if(i != rows.length-1)
textArea.append(",");
}
}

}
});
}
}

Answer 2

你在树形结构上注册一个鼠标事件就好了，很简单