Creating a Split Pane 

 
 // A left-right split pane.
 JSplitPane hpane = new JSplitPane(
   JSplitPane.HORIZONTAL_SPLIT, leftComponent,
     rightComponent);
     
 // A top-bottom split pane.
 JSplitPane vpane = new JSplitPane(
   JSplitPane.VERTICAL_SPLIT, topComponent,
     bottomComponent);