https://docs.oracle.com/javase/jp/11/docs/api/java.desktop/javax/swing/plaf/metal/MetalBorders.Flush3DBorder.html
MetalBorders.Flush3DBorder (Java SE 11 & JDK 11 )
java sejdk
https://docs.oracle.com/en/java/javase/17/docs/api/java.desktop/javax/swing/plaf/metal/MetalBorders.Flush3DBorder.html
MetalBorders.Flush3DBorder (Java SE 17 & JDK 17)
declaration: module: java.desktop, package: javax.swing.plaf.metal, class: MetalBorders, class: Flush3DBorder
java sejdk