java jtree 图标_java – 动态更改JTree中特定节点的图标

您可以根据不同的条件设置不同的图标.下面是一个更改所选节点图标的简单示例：

import java.awt.Component;

import javax.swing.Icon;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.DefaultTreeModel;

public class TestTree {

private static void createAndShowUI() {

JFrame frame = new JFrame();

final JTree tree = new JTree(buildDemoModel());

tree.setCellRenderer(new DefaultTreeCellRenderer() {

private Icon loadIcon = UIManager.getIcon("OptionPane.errorIcon");

private Icon saveIcon = UIManager.getIcon("OptionPane.informationIcon");

@Override

public Component getTreeCellRendererComponent(JTree tree,boolean selected,boolean isLeaf,boolean focused) {

Component c = super.getTreeCellRendererComponent(tree,isLeaf,focused);

if (selected)

setIcon(loadIcon);

else

setIcon(saveIcon);

return c;

}

});

tree.setVisibleRowCount(10);

frame.add(new JScrollPane(tree));

frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationByPlatform(true);

frame.pack();

frame.setVisible(true);

}

private static DefaultTreeModel buildDemoModel() {

DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");

root.add(new DefaultMutableTreeNode("A"));

root.add(new DefaultMutableTreeNode("B"));

root.add(new DefaultMutableTreeNode("C"));

return new DefaultTreeModel(root);

}

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

createAndShowUI();

}

});

}

}