https://docs.oracle.com/javase/jp/11/docs/api/java.desktop/javax/swing/plaf/synth/SynthSplitPaneUI.html
SynthSplitPaneUI (Java SE 11 & JDK 11 )
java sejdk
https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/javax/swing/plaf/synth/SynthSplitPaneUI.html
SynthSplitPaneUI (Java SE 24 & JDK 24)
declaration: module: java.desktop, package: javax.swing.plaf.synth, class: SynthSplitPaneUI
java sejdk