我想调用这个方法，请问该如何调用

Question

我想调用bcprov-jdk15to18-1.66.jar包下的Fp()方法，但是调不出来，请问一下各位该如何调用，由于源码太多，这里列举主要部分代码如下

public abstract class ECPoint
{
    protected final static ECFieldElement[] EMPTY_ZS = new ECFieldElement[0];

    protected static ECFieldElement[] getInitialZCoords(ECCurve curve)
    {
        // Cope with null curve, most commonly used by implicitlyCa
        int coord = null == curve ? ECCurve.COORD_AFFINE : curve.getCoordinateSystem();

        switch (coord)
        {
        case ECCurve.COORD_AFFINE:
        case ECCurve.COORD_LAMBDA_AFFINE:
            return EMPTY_ZS;
        default:
            break;
        }

        ECFieldElement one = curve.fromBigInteger(ECConstants.ONE);

        switch (coord)
        {
        case ECCurve.COORD_HOMOGENEOUS:
        case ECCurve.COORD_JACOBIAN:
        case ECCurve.COORD_LAMBDA_PROJECTIVE:
            return new ECFieldElement[]{ one };
        case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
            return new ECFieldElement[]{ one, one, one };
        case ECCurve.COORD_JACOBIAN_MODIFIED:
            return new ECFieldElement[]{ one, curve.getA() };
        default:
            throw new IllegalArgumentException("unknown coordinate system");
        }
    }

    protected ECCurve curve;
    protected ECFieldElement x;
    protected ECFieldElement y;
    protected ECFieldElement[] zs;

    // Hashtable is (String -> PreCompInfo)
    protected Hashtable preCompTable = null;

    protected ECPoint(ECCurve curve, ECFieldElement x, ECFieldElement y)
    {
        this(curve, x, y, getInitialZCoords(curve));
    }

    protected ECPoint(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
    {
        this.curve = curve;
        this.x = x;
        this.y = y;
        this.zs = zs;
    }

public static abstract class AbstractFp extends ECPoint
    {
        protected AbstractFp(ECCurve curve, ECFieldElement x, ECFieldElement y)
        {
            super(curve, x, y);
        }

        protected AbstractFp(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
        {
            super(curve, x, y, zs);
        }

 public static class Fp extends AbstractFp
    {
        Fp(ECCurve curve, ECFieldElement x, ECFieldElement y)
        {
            super(curve, x, y);
        }

        Fp(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
        {
            super(curve, x, y, zs);
        }



}

Answer 1

• 构造方法 没有public 修饰 ，默认同包下的才能访问，你 要建一个 跟 ECPoint 同目录的类，在这个类里面按如下去调用

ECPoint.Fp fp = new ECPoint.Fp(null, null, null);