public class Pair {
    public double u, v;

    public Pair(double u, double v) {
        this.u = u;
        this.v = v;
    }
}

public class Vertex extends Point3 {
    public Vector3 vn = null;
    public Pair vt = null;

    public Vertex(double x, double y, double z) {
        super(x, y, z);
    }
}

public class Face {
    public Vertex p0;
    public Vertex p1;
    public Vertex p2;

    public Face(Vertex p0, Vertex p1, Vertex p2) {
        this.p0 = p0;
        this.p1 = p1;
        this.p2 = p2;
    }
}

public class Triangle implements Object {
    public Face face; //public for debugging
    private final double epsilon = 0.00001;
    private Vector3 normal;
    private boolean smoothShaded = false;

    public Material material;

    // constructor with smooth shaded boolean for defining a normal
    public Triangle(Vertex v1, Vertex v2, Vertex v3, boolean smoothShaded) {
        face = new Face(v1, v2, v3);
        this.smoothShaded = smoothShaded;
    }

    ..........................

//in format: v/vt/vn
String[] aEls = a.split("/");
String[] bEls = b.split("/");
String[] cEls = c.split("/");
Vertex v1 = vertexList.get(Integer.parseInt(aEls[0]) - 1);
Vertex v2 = vertexList.get(Integer.parseInt(bEls[0]) - 1);
Vertex v3 = vertexList.get(Integer.parseInt(cEls[0]) - 1);
v1.vt = vtList.get(Integer.parseInt(aEls[1]) - 1);
v2.vt = vtList.get(Integer.parseInt(bEls[1]) - 1);
v3.vt = vtList.get(Integer.parseInt(cEls[1]) - 1);
v1.vn = normals.get(Integer.parseInt(aEls[2]) - 1);
v2.vn = normals.get(Integer.parseInt(bEls[2]) - 1);
v3.vn = normals.get(Integer.parseInt(cEls[2]) - 1);
Triangle t = new Triangle(v1, v2, v3, true);
t.material = currentMtl;
if (currentTexture != null) {
    t.material.texture = currentTexture;
}
System.out.println("unlisted!");
System.out.println("vt 0 a: " + t.face.p0.vt.u + ", vt b: " +  t.face.p0.vt.v);
System.out.println("vt 1 a: " + t.face.p1.vt.u + ", vt b: " + t.face.p1.vt.v);
System.out.println("vt 2 a: " + t.face.p2.vt.u + ", vt b: " + t.face.p2.vt.v);
addTriangle(t);
System.out.println("Current triangles: ");
for (Triangle tr : triangleList) {
    System.out.println("vt 0 a: " + tr.face.p0.vt.u + ", vt b: " + tr.face.p0.vt.v);
    System.out.println("vt 1 a: " + tr.face.p1.vt.u + ", vt b: " + tr.face.p1.vt.v);
    System.out.println("vt 2 a: " + tr.face.p2.vt.u + ", vt b: " + tr.face.p2.vt.v);
}

private void addTriangle(Triangle t){
    if(triangleList != null){
        int newSize = triangleList.length + 1;
        Triangle[] temp = new Triangle[newSize];
        for(int i = 0; i < triangleList.length;i++){
            temp[i] = triangleList[i];
        }
        temp[newSize-1] = t;
        triangleList = temp;
    }else{
        triangleList = new Triangle[]{t};
    }
}