https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/plaf/basic/BasicBorders.MenuBarBorder.html
BasicBorders.MenuBarBorder (Java SE 21 & JDK 21)
declaration: module: java.desktop, package: javax.swing.plaf.basic, class: BasicBorders, class: MenuBarBorder
java sejdk