https://docs.oracle.com/javase/jp/23/docs/api/java.desktop/javax/swing/text/StyledEditorKit.UnderlineAction.html
StyledEditorKit.UnderlineAction (Java SE 23 & JDK 23)
declaration: module: java.desktop, package: javax.swing.text, class: StyledEditorKit, class: UnderlineAction
java sejdk