java - 错误数组维度缺失

Question

我总是缺少数组维度

public static Planet[] readPlanets(String filename) {

    allPlanets = new Planet[];
    In in = new In (filename);
    int nplanets = in.readInt();
    double radius = in.readDouble();
    for (int i = 0; i < allPlanets.length; i++) {
        double pxxPos = in.readDouble();
        double pyyPos = in.readDouble();
        double pxxVel = in.readDouble();
        double pyyVel = in.readDouble();
        double pmass = in.readDouble();
        String pimgFileName = in.readString();
    }
    return allPlanets;
}

行星有六个维度，我有一个由多个行星组成的数组

Answer 1

您必须先声明数组的大小，然后才能使用它的 length 属性。

例如:

allPlanets = new Planet[6];