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JAVA JTree Icon node

The following code adds icons on JTree node. Each node could have different icon. This example has four files:,, and

/*Example modified from

import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;

public class IconNode extends DefaultMutableTreeNode {

protected Icon icon;
protected String iconName;

public IconNode() {

public IconNode(Object userObject) {
this(userObject, true, null);

public IconNode(Object userObject, boolean allowsChildren
, Icon icon) {
super(userObject, allowsChildren);
this.icon = icon;


public void setIcon(Icon icon) {
this.icon = icon;

public Icon getIcon() {
return icon;

public String getIconName() {
if (iconName != null) {
return iconName;
} else {
String str = userObject.toString();
int index = str.lastIndexOf(".");
if (index != -1) {
return str.substring(++index);
} else {
return null;

public void setIconName(String name) {
iconName = name;




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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)


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