Question

How do I give input directly, when that function is invoked in another method, especially when that input is a double[] array?

public double dotPro1(double[] vectorA, double[] vectorB) {
    double[] vecPro;
    vecPro = new double[2];
    vecPro[0] = vectorA[0]*vectorB[0];
    vecPro[1] = vectorA[1]*vectorB[1];
    return vecPro[0] + vecPro[1];
}
public double dotPro2(double[] length) {
    double[] lenPro;
    lenPro = new double[1];
    lenPro[0] = length[0];
    return lenPro[0];
}
public static double cosine(double a) {
    double x = Math.cos(Math.toRadians(a));
    /*Class c = Class.forName("NaiveStrategy");
        Class methodTypes[] = new Class[3];
        methodTypes[0] = Double.TYPE;
        methodTypes[1] = Double.TYPE;
        methodTypes[2] = Double.TYPE;
        Method[] m = c.getMethods();*/
    NaiveStrategy ns = new NaiveStrategy();
  problem-->ns.dotPro1(vectorA[], vectorB[]);
  problem-->ns.dotPro2(length[]);
    return 0;  
}

As you can also see my old coding I tried in another way to solve it, but it didn’t worked. It’s commented out above.

Answer 1

You said in one comment that you want random values. So use the Random class to generate them.

double[] list1 = new double[5];
double[] list2 = new double[5];
Random rand = new Random();
for (int i = 0; i < list1.length; i++) {
    list1[i] = rand.nextDouble();
}

for (int i = 0; i < list2.length; i++) {
    list2[i] = rand.nextDouble();
}

The new double[5]; will create an array of length 5. Change this number to the length you want.

Note: rand.nextdouble only gives a random number between 0 and 1. If you wish it to , say, be between 0 and 100 then use rand.nextDouble()*100

You can then just use

double result1 = ns.dotPro1(list1, list2);