VehicleDifferentialSettings: refactor

src/main/java/com/github/stephengold/joltjni/VehicleDifferentialSettings.java

@@ -28,29 +28,18 @@ of this software and associated documentation files (the "Software"), to deal
  * @author Stephen Gold [email protected]
  */
 public class VehicleDifferentialSettings extends JoltPhysicsObject {
-    // *************************************************************************
-    // fields
-
-    /**
-     * prevent premature garbage collection of the underlying
-     * {@code WheeledVehicleControllerSettings}
-     */
-    final private WheeledVehicleControllerSettings vehicle;
     // *************************************************************************
     // constructors
 
     /**
-     * Instantiate a settings with the specified native object assigned but not
-     * owned.
+     * Instantiate with the specified container and native object.
      *
-     * @param vehicle the underlying {@code WheeledVehicleControllerSettings}
+     * @param container the containing object, or {@code null} if none
      * @param settingsVa the virtual address of the native object to assign (not
      * zero)
      */
-    VehicleDifferentialSettings(
-            WheeledVehicleControllerSettings vehicle, long settingsVa) {
-        this.vehicle = vehicle;
-        setVirtualAddress(settingsVa, null);
+    VehicleDifferentialSettings(JoltPhysicsObject container, long settingsVa) {
+        super(container, settingsVa);
     }
     // *************************************************************************
     // new methods exposed