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