diff --git a/src/test/java/testjoltjni/app/samples/Layers.java b/src/test/java/testjoltjni/app/samples/Layers.java
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+/*
+Copyright (c) 2024 Stephen Gold
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+package testjoltjni.app.samples;
+import com.github.stephengold.joltjni.*;
+
+/**
+ * A straightforward Java translation of the Jolt Physics layer definitions for
+ * the samples app.
+ * <p>
+ * Compare with the original by Jorrit Rouwe at
+ * https://github.com/jrouwe/JoltPhysics/blob/master/Samples/Layers.h
+ */
+/// Layer that objects can be in, determines which other objects it can collide with
+class Layers
+{
+	static final int UNUSED1 = 0; // 4 unused values so that broadphase layers values don't match with object layer values (for testing purposes)
+	static final int UNUSED2 = 1;
+	static final int UNUSED3 = 2;
+	static final int UNUSED4 = 3;
+	static final int NON_MOVING = 4;
+	static final int MOVING = 5;
+	static final int DEBRIS = 6; // Example: Debris collides only with NON_MOVING
+	static final int SENSOR = 7; // Sensors only collide with MOVING objects
+	static final int NUM_LAYERS = 8;
+};
+
+/// Class that determines if two object layers can collide
+class ObjectLayerPairFilterImpl extends ObjVsObjFilter
+{
+	ObjectLayerPairFilterImpl() {
+		super(Layers.NUM_LAYERS);
+		disableLayer(Layers.UNUSED1);
+		disableLayer(Layers.UNUSED2);
+		disableLayer(Layers.UNUSED3);
+		disableLayer(Layers.UNUSED4);
+		disablePair(Layers.NON_MOVING, Layers.NON_MOVING);
+		disablePair(Layers.NON_MOVING, Layers.SENSOR);
+		disablePair(Layers.MOVING, Layers.DEBRIS);
+		disablePair(Layers.DEBRIS, Layers.DEBRIS);
+		disablePair(Layers.DEBRIS, Layers.SENSOR);
+		disablePair(Layers.SENSOR, Layers.SENSOR);
+	}
+};
+
+/// Broadphase layers
+class BroadPhaseLayers
+{
+	static final int NON_MOVING = 0;
+	static final int MOVING = 1;
+	static final int DEBRIS = 2;
+	static final int SENSOR = 3;
+	static final int UNUSED = 4;
+	static final int NUM_LAYERS = 5;
+};
+
+/// BroadPhaseLayerInterface implementation
+class BPLayerInterfaceImpl extends MapObj2Bp
+{
+									BPLayerInterfaceImpl()
+	{
+		super(Layers.NUM_LAYERS, BroadPhaseLayers.NUM_LAYERS);
+		// Create a mapping table from object to broad phase layer
+		add(Layers.UNUSED1, BroadPhaseLayers.UNUSED);
+		add(Layers.UNUSED2, BroadPhaseLayers.UNUSED);
+		add(Layers.UNUSED3, BroadPhaseLayers.UNUSED);
+		add(Layers.UNUSED4, BroadPhaseLayers.UNUSED);
+		add(Layers.NON_MOVING, BroadPhaseLayers.NON_MOVING);
+		add(Layers.MOVING, BroadPhaseLayers.MOVING);
+		add(Layers.DEBRIS, BroadPhaseLayers.DEBRIS);
+		add(Layers.SENSOR, BroadPhaseLayers.SENSOR);
+	}
+};
+
+/// Class that determines if an object layer can collide with a broadphase layer
+class ObjectVsBroadPhaseLayerFilterImpl extends ObjVsBpFilter
+{
+	ObjectVsBroadPhaseLayerFilterImpl() {
+		super(Layers.NUM_LAYERS, BroadPhaseLayers.NUM_LAYERS);
+		disableBp(BroadPhaseLayers.UNUSED);
+		disableObj(Layers.UNUSED1);
+		disableObj(Layers.UNUSED2);
+		disableObj(Layers.UNUSED3);
+		disableObj(Layers.UNUSED4);
+		disablePair(Layers.NON_MOVING, BroadPhaseLayers.NON_MOVING);
+		disablePair(Layers.NON_MOVING, BroadPhaseLayers.SENSOR);
+		disablePair(Layers.MOVING, BroadPhaseLayers.DEBRIS);
+		disablePair(Layers.DEBRIS, BroadPhaseLayers.MOVING);
+		disablePair(Layers.DEBRIS, BroadPhaseLayers.DEBRIS);
+		disablePair(Layers.DEBRIS, BroadPhaseLayers.SENSOR);
+		disablePair(Layers.SENSOR, BroadPhaseLayers.NON_MOVING);
+		disablePair(Layers.SENSOR, BroadPhaseLayers.DEBRIS);
+		disablePair(Layers.SENSOR, BroadPhaseLayers.SENSOR);
+	}
+};