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