Shape_main.java

public static void main(String[] args) throws Exception {
    int cnt = Integer.parseInt(args[0]);
    long seed = Long.parseLong(args[1]);
    int repeat = Integer.parseInt(args[2]);
    Shape[] samples = generate(3, args, cnt, seed);
    double expected = computeArea(samples);
    long prev = System.currentTimeMillis();
    for (int i = 0; i < repeat * 1000; i++) {
        double sum = computeArea(samples);
        if (sum  != expected) {
            throw new IllegalStateException();
        }
        if (i % 1000 == 0) {
            prev = System.currentTimeMillis();
        }
    }
    System.err.println("last round " + (System.currentTimeMillis() - prev) + " ms.");
}
static Shape[] generate(int offset, String[] types, int count, long seed) {
    java.util.Random r = new java.util.Random(seed);
    Shape[] arr = new Shape[count];
    for (int i = 0; i < arr.length; i++) {
        String t = types[offset + i % (types.length - offset)];
        Shape s;
        switch (t) {
            case "circle":
                s = Shape.cicle(r.nextDouble());
                break;
            case "rectangle":
                s = Shape.rectangle(r.nextDouble(), r.nextDouble());
                break;
            case "square":
                s = Shape.square(r.nextDouble());
                break;
            case "triangle":
                s = Shape.triangle(r.nextDouble(), r.nextDouble());
                break;
            default:
                throw new IllegalStateException("" + t);
        }
        arr[i] = s;
    }
    return arr;
}