https://docs.oracle.com/javase/jp/6/api/javax/swing/plaf/basic/BasicToolBarUI.DockingListener.html
BasicToolBarUI.DockingListener (Java Platform SE 6)
java platformse
https://docs.oracle.com/javase/jp/18/docs/api/java.desktop/javax/swing/plaf/basic/BasicToolBarUI.DockingListener.html
BasicToolBarUI.DockingListener (Java SE 18 & JDK 18)
declaration: module: java.desktop, package: javax.swing.plaf.basic, class: BasicToolBarUI, class: DockingListener
java sejdk