Best books about JAVA programming:

• Head First JAVA, Second Editon
• Effective Java Programming Language Guide
• Professional Java, JDK 5 Edition
• Ivor Horton's Beginning Java 2, JDK 5 Edition

JAVA JTree Diabled icon

The following code disable JTree node dynamically. This example has three files: DisabledNodeTreeExample2.java,DisabledNode.java and GraydIcon.java.

/*Example modified from http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples2.html
*/


import javax.swing.tree.*;

public class DisabledNode extends DefaultMutableTreeNode {
protected boolean enabled;

public DisabledNode() {
this(null, true, true);
}

public DisabledNode(Object userObject) {
this(userObject, true, true);
}

public DisabledNode(Object userObject, boolean allowsChildren) {
this(userObject, allowsChildren, true);
}

public DisabledNode(Object userObject, boolean allowsChildren
, boolean enabled) {
super(userObject, allowsChildren);
this.enabled = enabled;
}

public int getChildCount() {
if (enabled) {
return super.getChildCount();
} else {
return 0;
}
}

public boolean isLeaf() {
return (super.getChildCount() == 0);
}

public void setEnabled(boolean enabled) {
this.enabled = enabled;
}

public boolean isEnabled() {
return enabled;
}
}