https://openjdk.java.net/ 
public interface javax.swing.event.TreeExpansionListener extends java.util.EventListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.swing.event.TreeExpansionListener
  super_class: java.lang.Object
{
  public abstract void treeExpanded(javax.swing.event.TreeExpansionEvent);
    descriptor: (Ljavax/swing/event/TreeExpansionEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      event  

  public abstract void treeCollapsed(javax.swing.event.TreeExpansionEvent);
    descriptor: (Ljavax/swing/event/TreeExpansionEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      event  
}
SourceFile: "TreeExpansionListener.java"