JavaFX 应用程序中出现意外的 ArrayIndexOutOfBoundsException，指的是没有数组

Question

我有以下代码：

 public void setContent(Importer3D importer) {
    if (DEBUG) {
        System.out.println("Initialization of Mesh's arrays");
    }
    coords = importer.getCoords();
    texCoords = importer.getTexCoords();
    faces = importer.getFaces();
    if (DEBUG) {
        System.out.println("Applying Mesh's arrays");
    }
    mesh = new TriangleMesh();
    mesh.getPoints().setAll(coords);
    mesh.getTexCoords().setAll(texCoords);
    mesh.getFaces().setAll(faces);
    if (DEBUG) {
        System.out.println("Initialization of the material");
    }
    initMaterial();
    if (DEBUG) {
        System.out.println("Setting the MeshView");
    }
    meshView.setMesh(mesh);
    meshView.setMaterial(material);
    meshView.setDrawMode(DrawMode.FILL);
    if (DEBUG) {
        System.out.println("Adding to 3D scene");
    }
    root3d.getChildren().clear();
    root3d.getChildren().add(meshView);
    if (DEBUG) {
        System.out.println("3D model is ready!");
    }
}

Imporeter3D 类部分：

  private void load(File file) {

    stlLoader = new STLLoader(file);
}

public float[] getCoords() {
    return stlLoader.getCoords();
}

public float[] getTexCoords() {
    return stlLoader.getTexCoords();
}

public int[] getFaces() {
    return stlLoader.getFaces();
}

STLLoader：

public class STLLoader{
public STLLoader(File file) {
    stlFile = new STLFile(file);
    loadManager = stlFile.loadManager;
    pointsArray = new PointsArray(stlFile);
    texCoordsArray = new TexCoordsArray();
}

public float[] getCoords() {
    return pointsArray.getPoints();
}

public float[] getTexCoords() {
    return texCoordsArray.getTexCoords();
}

public int[] getFaces() {
    return pointsArray.getFaces();
}

private STLFile stlFile;
private PointsArray pointsArray;
private TexCoordsArray texCoordsArray;
private FacesArray facesArray;
public  SimpleBooleanProperty finished = new SimpleBooleanProperty(false);
public LoadManager loadManager;}

PointsArray 文件：

public class PointsArray {
public PointsArray(STLFile stlFile) {
    this.stlFile = stlFile;
    initPoints();
}

private void initPoints() {
    ArrayList<Double> pointsList = stlFile.getPoints();
    ArrayList<Double> uPointsList = new ArrayList<>();


    faces = new int[pointsList.size()*2];
    int n = 0;
    for (Double d : pointsList) {
        if (uPointsList.indexOf(d) == -1) {
            uPointsList.add(d);
        }
        faces[n] = uPointsList.indexOf(d);
        faces[++n] = 0;
        n++;
    }
    int i = 0;

    points = new float[uPointsList.size()];
    for (Double d : uPointsList) {
        points[i] = d.floatValue();
        i++;
    }
}

public float[] getPoints() {
    return points;
}

public  int[] getFaces() {
    return faces;
}

private float[] points;
private int[] faces;
private STLFile stlFile;
public static boolean DEBUG = true;

}

还有 STLFile：

    ArrayList<Double> coords = new ArrayList<>();
double temp;
private void readV(STLParser parser) {
    for (int n = 0; n < 3; n++) {
        if(!(parser.ttype==STLParser.TT_WORD && parser.sval.equals("vertex"))) {
            System.err.println("Format Error:expecting 'vertex' on line " + parser.lineno());
        } else {
            if (parser.getNumber()) {
                temp = parser.nval;
                coords.add(temp);
                if(DEBUG) {
                    System.out.println("Vertex:");
                    System.out.print("X=" + temp + " ");
                }

                if (parser.getNumber()) {
                    temp = parser.nval;
                    coords.add(temp);
                    if(DEBUG) {
                        System.out.print("Y=" + temp + " ");
                    }

                    if (parser.getNumber()) {
                        temp = parser.nval;
                        coords.add(temp);
                        if(DEBUG) {
                            System.out.println("Z=" + temp + " ");
                        }


                        readEOL(parser);
                    } else System.err.println("Format Error: expecting coordinate on line " + parser.lineno());
                } else System.err.println("Format Error: expecting coordinate on line " + parser.lineno());
            } else System.err.println("Format Error: expecting coordinate on line " + parser.lineno());
        }
        if (n < 2) {
            try {
                parser.nextToken();
            } catch (IOException e) {
                System.err.println("IO Error on line " + parser.lineno() + ": " + e.getMessage());
            }
        }
    }

}

public ArrayList<Double> getPoints() {
    return coords;
}

由于所有这些代码，我希望在 MeshView 中获得 3d 模型。但是现在的结果很奇怪：一切正常，在DEBUG 模式下，我从setContent() 得到3d model is ready!，然后是意想不到的ArrayIndexOutOfBoundsException：

File readed
Initialization of Mesh's arrays
Applying Mesh's arrays
Initialization of the material
Setting the MeshView
Adding to 3D scene
3D model is ready!
java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 32252
    at com.sun.javafx.collections.ObservableFloatArrayImpl.rangeCheck(ObservableFloatArrayImpl.java:276)
    at com.sun.javafx.collections.ObservableFloatArrayImpl.get(ObservableFloatArrayImpl.java:184)
    at javafx.scene.shape.TriangleMesh.computeBounds(TriangleMesh.java:262)
    at javafx.scene.shape.MeshView.impl_computeGeomBounds(MeshView.java:151)
    at javafx.scene.Node.updateGeomBounds(Node.java:3497)
    at javafx.scene.Node.getGeomBounds(Node.java:3450)
    at javafx.scene.Node.getLocalBounds(Node.java:3432)
    at javafx.scene.Node.updateTxBounds(Node.java:3510)
    at javafx.scene.Node.getTransformedBounds(Node.java:3350)
    at javafx.scene.Node.updateBounds(Node.java:516)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.SubScene.updateBounds(SubScene.java:556)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.Parent.updateBounds(Parent.java:1668)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2309)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:329)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:479)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:459)
    at com.sun.javafx.tk.quantum.QuantumToolkit$13.run(QuantumToolkit.java:326)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:101)
    at java.lang.Thread.run(Thread.java:724)
Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 32252
    at com.sun.javafx.collections.ObservableFloatArrayImpl.rangeCheck(ObservableFloatArrayImpl.java:276)
    at com.sun.javafx.collections.ObservableFloatArrayImpl.get(ObservableFloatArrayImpl.java:184)

奇怪的是，这个堆栈直到我关闭程序才停止。而且它不指向任何我的数组。这是什么？为什么会这样？

Answer 1

TriangleMesh 将此数组视为点坐标（x,y,z，因为它是 3D），因此数组总长度应为cords.length % 3 == 0。